CHEMICAL COMPOSITIONS THAT ATTRACT ARTHROPODS

Abstract: Compositions and methods employing the compositions for attracting arthropods. The compositions comprise at least one compound of formula (I) and at least one compound from group (II).

Description: CHEMICAL COMPOSITIONS THAT ATTRACT ARTHROPODS BACKGROUND OF THE INVENTION Insects have plagued people throughout history. Fast intercontinental travel and trade have enabled the importation of nonindigenous insect pests (e.g., species of mosquitoes, such as Aedes albopictus, the Asian Tiger mosquito) into the United States. As a result, the U.S. must face the task of controlling numerous species of nuisance pests, such as arthropods and, more specifically, mosquitoes. Some of these insects spread disease and, thus, are of great medical and veterinary importance. Control of these pests is necessary to reduce or eliminate the spread of arthropod-borne diseases. The primary focus of this invention is the control or reduction of the population of mosquitoes. At least three "generations" of control methods have been developed over the years. The first generation of control methods comprise chemicals dispensed by foggers or sprayers, both on the ground and through the air. These chemicals may be classified as either adulticides or larvicides and are intended to attack and kill the adult mosquito or its larva, respectively. These chemicals usually have an inherent toxicity, which is potentially injurious to the environment, to marine life and wildlife, and ultimately to humans. As a result, these chemical insecticides have become viewed with disfavor. One such insecticide product was "DURSB AN™ 1 OCR" produced by Dow Chemical Company in the mid-1970's. There were at least two problems with this product. First, it was inherently toxic and potentially harmful to the environment. Second, because of rapid turnover of the mosquito population and the selection of resistant genes by Dursban, insects could develop a resistance to the chemicals. Mosquitoes ultimately develop an immunity to adulticides of the same chemical family. This situation is referred to as "cross resistance" and illustrates that under adverse conditions, insects may adapt. This ability to adapt, often within a few generations, provides complications for researchers engaged in the field of pest control. As a departure from the chemical adulticides and larvicides, a second generation of mosquito control product was developed. This second generation is known as insect growth regulators. Their purpose is to prevent the immature insect from transforming into an adult. This class of mosquito control product allows the larva to enter into its pupa stage but prevent the pupa from developing into an adult. These products have very low toxicity, or practically no toxicity, and hence are not detrimental to aquatic life. Due to the general application of this control material to the environment through a form such as a charcoal briquet, the products are messy, inconvenient to handle, and are very expensive. These products also require adequate surveillance of standing water and delivery of briquets to these locations. The potential exists that some sites will go untreated. Over the past fifteen years, a third generation of insecticides has been developed. These are bacteriological methods for spreading endotoxins among insect populations. One of the most successful endotoxin agents used against insects is Bacillus thuringiensis Berliner var. kurstaki, a bacterium which infects the larvae of Lepidoptera (moths) that are to be destroyed. More recently, a new variety has been uncovered for use against mosquito and black fly larvae. This is Bacillus thuringiensis Berliner var. israelensis and its accompanying proteinaceous parasporal particles which contain protoxin. When a larvicidal microorganism of the bacillus type is used and is sprayed on the water in the form of a liquid produced by diluting the wettable powder or liquid concentrate with water, a similar problem is encountered. The bacillus spores and protoxin particles are heavier than water and sink. Additionally, the application of the bacillus does not have a sustained release- it is essentially "one shot"- and hence re-applications are often necessary to insure an effective mosquito control program. This is time consuming and expensive, and extensive surveillance is needed to target all breeding areas. Besides these existing chemical and microbial insecticides, other devices and methods are known for the control or destruction of mosquitos and other aquatic pests. U.S. Letters Pat. Nos. 4,166,112 and 4,187,200, issued to Goldberg in 1979 and 1980, respectively, disclosed Bacillus thuringiensis in which a carrier was formulated as a buoyant colloidal suspension which stabilized just under the surface of the water. According to information published by Biochem Products, a division of Salsbury Laboratories, Inc., a member of the Solvay Group, the earliest documented record of ' Bacillus thuringiensis was in Japan in 1901. In the decades since, at least 14 varieties ofR.t have been identified from several countries on the bases of biochemical characteristics and serotyping of vegetative cell flagellar antigens. Bacillus thuringiensis, Berliner also known as HD-1, Serotype H-5 Jb, or R.t. variety kurstaki, has been registered in the United States since 1961 for control of Lepidopteran larvae or caterpillars and is the type commonly used in forestry, agriculture, home and commercial gardening and horticulture. Products containing R.t reportedly have an excellent safety record with no documented incidents of serious or undesirable side effects on man and the environment. Biochem Products supplies a wettable powder or a flowable concentrate under the trademark "BACTIMOS™" which is derived from R.t./., Serotype H-14, Bacillus thuringiensis variety israelensis, and was discovered in Israel in 1976. This is a larvicidal microorganism comprising Bacillus thuringiensis Berliner var. israelensis and its accompanying proteinaceous parasporal particles which contain protoxin (commonly referred to as "R.t./."). For mosquito control purposes, the BACTIMOS™ (R.t./.) is invariably mixed with water and is applied to large areas, using airplanes or helicopters. This method of application has been continually used despite the constant and critical need for an alternate delivery system for the myriad of ponds and other small bodies of water, as recognized in MOSQUITO NEWS in 1948. Moreover, any attempt to impregnate R.t./. (or the larvicidal microorganism of the aforesaid Goldberg patents) into the floating thermoplastic carrier of the aforesaid Cardarelli patent, would be impractical (if not impossible) and would destroy the stated utility of these references. An exposure of the R.t./. particles to temperatures above 70° or 80° Celsius - depending upon the exposure time, which is inversely correlated with temperature- will cause the R.t./. to suffer a protein denaturization, resulting in a change in its molecular structure and a loss of its activity. Thus, it would be impractical to attempt to incorporate R.t./. into a thermoplastic or elastomeric strip of material, in view of the molding temperatures likely to be encountered. Moreover, even if the R.t./. could be incorporated into a polymer or elastomeric matrix without substantially limiting or destroying its efficacy, these R.t./. particles are agglomerations of relatively large molecules and are incapable of migrating within a polymer or elastomeric matrix. Hence, they would not even be released, since the active protein toxin has a molecular weight of approximately 28 megadaltons. The aforementioned methods are efficient, but are performed at high monetary costs to mosquito districts and taxpayers. Ultimately, the mosquitoes sought to be controlled are those noticed readily by humans, i.e. mosquitoes and blood-sucking flies that draw blood meals from humans. Thus, numerous severe problems exist with the mosquito extermination methods that use chemical insecticides. As such, an alternative approach toward arthropod surveillance and control has been developed. One such promising method is the use of chemicals as attractants for mosquitoes and other arthropods that prey on human and animal hosts. The combination of highly effective chemical attractants with efficient traps allows for a control method to be developed similar to that used to control the Tsetse fly in Africa (Vale and Hall, Bull. Ent. Res., 75, 219-231 (1985)). Because effective attractants are known for the Tsetse fly, a ωntrol method using only baited traps was developed and is very effective. Current surveillance techniques rely on light traps or other traps which are relatively inefficient in mosquito collection. Sentinel chickens are used to assess transmission risk of encephalitis to humans in a local area. Better traps via more efficient and less expensive lures or baits would greatly aid in this endeavor. One example of a trap, U.S. Patent No. 5,657,756 to Nicosia, 1997, involves collection and trapping of arthropods using warmed circulated fluid. Carbon dioxide has been shown to attract mosquitoes. Willis, J. Exp. Zool., 121, 149- 179 (1952), discloses that Aedes αegypti (mosquitoes) are attracted to carbon dioxide. From amputation experiments on female Aedes αegypti, it was discovered that carbon dioxide receptors were located on the antennae. The role of carbon dioxide in the attraction of mosquitoes to hosts also has been the subject of numerous laboratory studies. Rudolfs, N. J. Aerie. Exp. Sta. Bull.. 367 (1922), and Gouck, J. Econ. Entomol., 55, 386-392 (1962), describe carbon dioxide as an activator, rather than an actual attractant. Acree, Science, 1346-7 (1968), discloses that L-lactic acid, isolated from the human hand, attracts female Aedes αegypti. It also discloses that carbon dioxide is necessary to observe this attraction. Wensler, Can. J. Zool., 50, 415-420 (1972), discloses the use of ethyl ether soluble honey odors to attract Ae. αegypti. Compositions consisting of lactic acid analogues and carbon dioxide have also been shown to attract mosquitoes. Carlson, J. Econ. Entomol.. 66, 329-331 (1973), discloses that some tested analogues of lactic acid had equivalent attraction to L-lactic acid, but this was not true at all tested doses. The highest reported attraction was 40% of female Ae. αegypti. Bar-Zeev, J. Med. Entomol., 14. 113-20 (1977), discloses that a composition consisting solely of lactic acid and carbon dioxide attracts e. αegypti. Here, the lactic acid was dissolved in acetone, similar to the use of methanol for the invention described in this application. It is clearly stated that the acetone solvent was evaporated from the filter paper prior to the carbon dioxide being allowed to pass into the flask. Acetone was chosen for its properties as a solvent, i.e., good ability to dissolve Uactic acid and high volatility resulting in rapid evaporation or drying. Price, J. Chem. Ecol., 5, 383-95 (1979), discloses that human emanations and carbon dioxide attract female An. quαdrimαculαtus. Lactic acid was shown to attract mosquitoes such as virgin-4e. αegypti (mosquitoes) by Davis, J. Insect Physiol., 30, 211-15 (1984). Gillies, Bull. Entomol. Res., 70, 525-32 (1980), reviews the use of carbon dioxide to activate and attract mosquitoes. Schreck, J. Chem. Ecol.. 8, 429-38 (1981), discloses that materials isolated from human hands, other than L-lactic acid, attract female Ae. aegypti and An. quadrimaculatus mosquitoes. Lactic acid, in combination with phosphorous-containing compounds have been shown to attract mosquitoes. Ikeshoii. Jpn. J. Sank. Zool. 38. 333-38 (1987), discloses lactic acid and hempa; lactic acid and metepa; lactic acid, metepa and olive oil; and lactic acid and DDVP attract mosquitoes. Lactic acid-related compounds have also been tested as mosquito attractants by electrophysiology. Davis, J. Insect Physiol., 34, 443-49 (1988), discloses that neurons in the antennae are excited by L-lactic acid, and that analogues of lactic acid, e.g., carboxylic acids, alcohols, hydroxyacids, aldehydes, thiols and haloacids were tested for neuron response. It was shown that no compound elicited as high of a relative responsiveness toward lactic acid- excited cells as did lactic itself. It has been shown that carbon dioxide, in combination with other chemicals, serves as an attractant for mosquitoes. Takken and Kline, J. Am. Mosq. Control Assoc, 5, 311-6 (1989), disclose l-octen-3-ol (octenol) and carbon dioxide as mosquito attractants. Van Essen. Med. Vet. Entomol., 63-7 (1993), discloses the use of carbon dioxide, octenol, and light to attract several species of mosquitoes. Takken, J. Insect Behavior, 10, 395-407 (1997). discloses that a composition consisting solely of carbon dioxide, acetone and octenol attracts several species of mosquitoes. Kline, Med. Vet. Entomol., 4, 383-91 (1990), discloses that honey extract, octenol, carbon dioxide, L-lactic acid plus carbon dioxide, L-lactic acid plus octenol plus carbon dioxide attract mosquitoes well and butanone plus carbon dioxide, and phenol alone are less effective. Schreck, J. Am. Mosq. Control Assoc, 6, 406-10 (1990), discloses that materials isolated from human skin attract female Ae. aegypti anάAn. quadrimaculatus (mosquitoes), and the level of attraction, transferred to glass, varies from person to person. It also discloses that differences in attraction level are present depending on the body location origin of the material. Takken, Insect Sci. Applic, 12, 287-95 (1991), reviews mosquito attractants and lists acids, alone or in combination with other amino acids that are attractive for mosquitoes. Eiras, Bull. Entomol. Res., 81_. 151-60 (1991), discloses that lactic acid, carbon dioxide, human sweat and thermal convection currents attract female Ae. aegypti. Carlson, J. Med. Entomol., 29, 165-70 (1992), discloses that the release of carbon dioxide from the human hand is negligible and therefore is not a factor in the attraction oϊAe. aegypti (mosquitoes) to the human hand. Bowen, J. Insect Physiol., 40, 611-15 (1994), discloses that lactic acid sensitive receptors are present in-4e. atropalpus. Eiras, Bull. Entomol. Res., 84 . 207-11 (1994), discloses that lactic acid in combination with carbon dioxide has been shown to attract mosquitoes. Charlwood, Ann. Trop. Med. Parasitol., 89, 327-9 (1995), discloses the mosquito- mediated attraction of female mosquitoes to hosts. Several species of mosquitoes were more attracted to a host, e.g., human leg, which already had mosquitoes feeding than a host which had no mosquitoes feeding on the host (termed "invitation effect"). An apparent pheromone, which was given off by the feeding mosquitoes, was speculated to attract other mosquitoes to the host. DeJong and Knols, Experientia, 51, 80-4 (1995), discloses that different malaria mosquito species (An. gambiae s.s. anά An. αtropαrvus) prefer different biting sites on the human body. DeJong and Knols, Acta Tropica, 59, 333-5 (1995), disclose that -4,*?. gαmbiαe is attracted to carbon dioxide. Bernier, Ph.D. Dissertation, University of Florida (1995), discloses the presence of lactic acid, glycerol, and long chain acids and alcohols on the skin, as well as other chemicals for a total of over 300 compounds. Some of these were identified and examined as candidate attractants. Geier, in Olfaction in Mosquito-Host Interactions, 132-47 (1996), discloses that carbon dioxide alone is an attractant and that lactic acid alone is a mild attractant, but that the two act as a synergistic attractant. It also discloses that fractions of ethanol washings from human sMn are attractive. Knols and DeJong, Parasitol. Today, 12, 159-61 (1996), disclose that carbon dioxide in combination with Limburger cheese, serves as an attractant for female-4«. gαmbiαe. It was suggested that mosquitoes are attracted to odors emanating from feet and ankles and this odor resembles Limburger cheese. It was also suggested that the odor of Limburger cheese was due to bacteria involved in cheese production which originate in human skin; cornyeform bacteria, in particular strains of Brevibαcterium linens, which is closely related to Rr. epidermidis, which forms part of the normal microflora of human feet, methanethiol, a pungent sulfur compound which is metabolized from L-methionine liberated during proteolytic activity and reported to contribute substantially to both cheese and foot odor; or the significant quantities of short-chained fatty acids in Limburger cheese. McCall, J. Med. Entomol., 33, 177-9 (1996), discloses that-4e. aegypti (mosquitoes) were attracted to volatile constituents of mouse odor, but did not identify potential chemicals. Knols, Bull. Entomol. Res., 87, 151-9 (1997), discloses the use of Limburger cheese (the acid and non-acid solvent extracted fractions) to attract An. gambiae (mosquitoes). Nineteen saturated and unsaturated aliphatic fatty acids, ranging in carbon chain lengths from C -Cι were identified in Limburger cheese. Mboera, J. Vector Ecol., 23, 107-13 (1998), disclosed that Culex quinquefasciatus is attracted to a worn stocking and that carbon dioxide plus body odor did not increase response. Kline, J.Vector. Ecol. 23, 186-94 (1998), disclosed that in olfactometer tests, the human hand or worn sock attracted 80% and 66%, respecively, ofAe. aegypti in the cage. In comparison, Limburger cheese attracted 6.4%, and the control 0.0% in the olfactometer. Bernier, Anal. Chem.. 71. 1-7 (1999), discloses the method for analysis of skin emanations, including the identification of lactic acid, glycerol, 2 -Cι 8 carboxylic acids and C 4 -Cπ aldehydes. Takken and Knots, Annu. Rev. Entomol., 44, 131-57 (1999), reviewed odor-mediated behavior of afrotropical mosquitoes, reaffirming carbon dioxide as the best known mosquito kairomone. Braks and Takken, J. Chem. Ecol., 25, 663-72 (1999), disclose that 2-day-old incubated sweat became attractive to An. gambiae. Various chemicals have been disclosed as attractants for mosquitoes. U.S. Patent 4,818,526 to Wilson discloses the use of dimethyl disulfide and dibutyl succinate and combinations thereof as attractants for Culicidae (mosquitoes). U.S. Patent 4,907,366 to Balfour (1990) discloses the use of a composition consisting solely of lactic acid, carbon dioxide, water, and heat to attract mosquitoes. PCT WO 98/26661 to Justus discloses mixtures of L-lactic acid and its sodium salt, glycerol, and cheese extracts, with and without unsaturated long chain carboxylic acids, alcohols and an amide as attractive ϊoτAe. aegypti. The glycerol, as well as other components described as equivalent to the glycerol, appear to make the composition substantive, so that it does not evaporate immediately in a rapid pulse. However, the active ingredients from Limburger cheese, which are the attractant chemicals, are not disclosed within the document, nor were statistical data reported for the results used in the examples. Several of the above-mentioned chemicals and chemical compositions have been employed to attract any of the hundreds of species of mosquitoes and related arthropods that utilize humans and animals as their hosts. In fact, many of the disclosed compositions have been claimed to be active as attractants for mosquitoes. The activities of these attractants are often inconsistent and below 50% attraction response in laboratory experiments. More specifically, none of the disclosed compositions have been able to attract mosquitoes on a consistent basis as efficiently as, or more efficiently than the human body. As such, the human body has been examined repeatedly to provide clues regarding the chemical compositions disclosed. Thus, while chemicals and chemical compositions may have been active in attracting mosquitoes, none have been classified as successful for mosquito attraction as those reported in this document. A long-felt need therefore exists for chemical compositions that can be employed safely in the environment, and that exhibit a synergistic effect for attracting mosquitoes wherein the compositions are more efficient than the human body in attracting mosquitoes. The present invention satisfies this need. Current mosquito traps often use carbon dioxide, which in prior art was needed for efficient collection and surveillance. The present invention obviates the need for large carbon dioxide gas cylinders or dry ice by providing mosquito attractants that perform as well as. and more efficiently in place of, carbon dioxide. Although carbon dioxide is not necessary, it can still be included to release blends, as some insects may be attracted only with its inclusion. SUMMARY OF THE INVENTION The present invention provides compositions that efficiently attract arthropods (e.g., mosquitoes). Accordingly there is provided a composition comprising: (A) an effective amount of at least one compound of formula I wherein each X is independently H, halogen, OH, SH, oxo, or ( -C 8 )alkyl group; each Y is independently H or ( -C 8 )alkyl group, Z is H, OH, SH, COOH, or (C,-C 8 )alkyl group; n is an integer between 1 and 10, inclusive; and salts thereof; and an effective amount of at least one compound from group II wherein group II compounds include a ketone having 3-10 carbon atoms, carbon dioxide, (C 2 -Cιo)alkene, Ci 0 )aldehyde, an alcohol having 1-8 carbon atoms, a halogenated compound containing 1-8 carbon atoms, a nitrile containing 2-4 carbon atoms, an ether containing 3-10 carbon atoms, (C 6 -Cιo)aryl group, a sulfide containing 1-8 carbon atoms and (C 3 -Cιo)heterocyclic group; wherein any one or more of the (C ό -Cιo)aryl group or (C 3 -Cιo)heterocyclic group may be substituted at any one or more positions with a substituent selected from the group consisting of H, oxo, halogen, OH, SH, COOH, COO(C,-C 8 )alkyl group, (C,-C 8 )alkyl group, (C C )alkyl sulfide and (Cι-C 8 )alkyl group; and salts thereof; wherein the composition is effective to attract arthropods; or (B) a composition comprising an effective amount of tartaric acid or an acceptable salt thereof; and an effective amount of at least one compound from group II wherein group II compounds include a ketone having 3-10 carbon atoms, (C 2 -Cιo)alkene, (Cι-Cιo)aldehyde, an alcohol having 1-8 carbon atoms, a halogenated compound containing 1-8 carbon atoms, a nitrile containing 2-4 carbon atoms, an ether containing 3-10 carbon atoms, carbon dioxide, (C 6 -Cιo)aryl group, a sulfide containing 1-8 carbon atoms and (C 3 -Cι 0 )heterocyclic group; wherein any one or more of the (C ό -Cιo)aryl or (C 3 -C,o)heterocyclic may be substituted at any one or more positions with a substituent selected from the group consisting of H. oxo, halogen, OH, SH, COOH, COO(C,-C 8 )alkyl group, (C,-C 8 )alkyl group, (C,-C 8 )alkyl sulfide and (Cι-C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen; and salts thereof; wherein the composition is effective to attract arthropods; or (C) a composition comprising an effective amount of at least one compound of formula wherein each X is independently H. halogen, OH, SH, oxo, ( -C 8 )alkyl, or (C \ - C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen; each Y is independently H, (Cj-C )alkyl, or (C|-C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen, or Y is absent when X is oxo; Z is H, OH, SH, COOH, (C,-C 8 )alkyl, or (C,-C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen; n is an integer between 1 and 10, inclusive; and acceptable salts thereof; and an effective amount of at least one compound from group II wherein group II compounds include a ketone having 3-10 carbon atoms, (C 2 -Cιo)alkene, (Cι-Cιo)aldehyde, an alcohol having 1-8 carbon atoms, a halogenated compound containing 1-8 carbon atoms, a nitrile containing 2-4 carbon atoms, an ether containing 3-10 carbon atoms, carbon dioxide, (C 6 -Cιo)aryl group, a sulfide containing 1-8 carbon atoms and (C3-Cιo)heterocyclic group; and salts thereof; with the proviso that the compound of formula I does not consist solely of glycolic acid, oxalic acid, acetic acid, hydraacrylic acid, pyruvic acid, glyceric acid, 3hydroxypyruvic acid, malonic acid, 3-hydroxybutyric acid, 2-methyllactic acid, 2-hydroxybutyric acid, 2- oxobutyric acid, isobutyric acid, butyric acid, malic acid, 2-oxovaleric acid, 2-hydroxyvaleric acid, 2-hydroxyvaleric acid, valeric acid, isovaleric acid, 2-methylvaleric acid, hexanoic acid, mercaptoacetic acid, thiolactic acid, 3-mercaptopropionic acid, thiopropionic acid, 3- mercaptopropionic acid, 2-bromopropionic acid, 2-bromobutyric acid, 2-chloropropionic acid, 3-chloropropionic acid, lactic acid or formic acid; and salts thereof; wherein the composition is effective to attract arthropods. The present invention provides compositions that efficiently attract arthropods (e.g., mosquitoes). Accordingly there is provided a composition comprising an effective amount of at least one compound of formula I wherein each X is independently H, halogen, OH, SH, oxo, ( -C 8 )alkyl group; each Y is independently H, ( -C 8 )alkyl group, Z is H, OH, SH, COOH, or (C,-C 8 )alkyl group; n is an integer between 1 and 10, inclusive; and salts thereof; and an effective amount of at least one compound from group II wherein group II compounds include a ketone having 3-10 carbon atoms, carbon dioxide, (C 2 -Cιo)alkene, (Ci- Cιo)aldehyde, an alcohol having 1-8 carbon atoms, a halogenated compound containing 1-8 carbon atoms, a nitrile containing 2-4 carbon atoms, an ether containing 3-10 carbon atoms, (C 6 -Cιo)aryl group, a sulfide containing 1-8 carbon atoms and (C 3 -Cιo)heterocyclic group; wherein any one or more of the (C -Cιo)aryl group or (C 3 -Cιo)heterocyclic group may be substituted at any one or more positions with a substituent selected from the group consisting of H, oxo, halogen, OH, SH, COOH, COO(Cι-C 8 )alkyl group, (d-C 8 )alkyl group, (C|-C 8 )alkyl sulfide, O-(Cι-C 8 )alkyl; (Cι-C 8 )alkyl group, and NR]R 2 wherein Ri and R 2 are each independently selected from the group consisting of ( -C 8 )alkyl and H; and salts thereof; wherein the composition is effective to attract arthropods. The present invention provides methods of attracting arthropods (e.g., mosquitoes) comprising the step of exposing the environment with a composition comprising an effective amount of a combination of: (A) an effective amount of at least one compound of formula I wherein each X is independently H, halogen, OH, SH, oxo, (Cι-C )alkyl group; each Y is independently H, ( -C 8 )alkyl group, Z is H, OH, SH, COOH, or (C,-C 8 )alkyl group; n is an integer between 1 and 10, inclusive; and salts thereof; and an effective amount of at least one compound from group II wherein group II compounds include a ketone having 3-10 carbon atoms, carbon dioxide, (C 2 -Cιo)alkene, (C \ - Cιo)aldehyde, an alcohol having 1-8 carbon atoms, a halogenated compound containing 1-8 carbon atoms, a nitrile containing 2-4 carbon atoms, an ether containing 3-10 carbon atoms, (C 6 -Cιo)aryl group, a sulfide containing 1-8 carbon atoms and (C 3 -Cιo)heterocyclic group; wherein any one or more of the (C 6 -Cιo)aryl group or (C 3 -C,o)heterocyclic group may be substituted at any one or more positions with a substituent selected from the group consisting of H, oxo. halogen, OH, SH, COOH, COO(C,-C 8 )alkyl group, (C,-C 8 )alkyl group, (C,-C 8 )alkyl sulfide. O-(C,-C 8 )alkyl; (C,-C 8 )alkyl group, and NR,R 2 wherein R, and R 2 are each independently selected from the group consisting of (C|-C 8 )alkyl and H; and salts thereof; or (B) a composition comprising an effective amount of tartaric acid or an acceptable salt thereof; and an effective amount of at least one compound from group II wherein group II compounds include a ketone having 3-10 carbon atoms, (C 2 -Cιo)alkene, (Cι-Cιo)aldehyde, an alcohol having 1-8 carbon atoms, a halogenated compound containing 1-8 carbon atoms, a nitrile containing 2-4 carbon atoms, an ether containing 3-10 carbon atoms, carbon dioxide, (C 6 -C|o)aryl group, a sulfide containing 1-8 carbon atoms and (C 3 -Cio)heterocyclic group; wherein any one or more of the (C 6 -Cιo)aryl group or (C 3 -Cιo)heterocyclic group may be substituted at any one or more positions with a substituent selected from the group consisting of H, oxo, halogen, OH, SH, COOH, COO(Cι-C 8 )alkyl group, (C C 8 )alkyl group, (Cι-C 8 )alkyl sulfide, O-(C,-C 8 )alkyl; (Cι-C 8 )alkyl group, and NRιR 2 wherein Ri and R 2 are each independently selected from the group consisting of ( -C 8 )alkyl and H; and salts thereof; wherein the composition is effective to attract arthropods; or (C) a composition comprising an effective amount of at least one compound of formula wherein each X is independently H, halogen, OH, SH, oxo, ( -C 8 )alkyl. or (Q- C )alkyl substituted with at least one substituent selected from the group consisting of H. OH, SH and halogen; each Y is independently H, (Cι-C 8 )alkyl, or (C]-C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen, or Y is absent when X is oxo; Z is H, OH, SH. COOH, (C,-C 8 )alkyl, or (C,-C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen; n is an integer between 1 and 10, inclusive; and acceptable salts thereof; and an effective amount of at least one compound from group II wherein group II compounds include a ketone having 3-10 carbon atoms, (C 2 -Cιo)alkene, (Cι-Cιo)aldehyde, an alcohol having 1-8 carbon atoms, a halogenated compound containing 1-8 carbon atoms, a nitrile containing 2-4 carbon atoms, an ether containing 3-10 carbon atoms, carbon dioxide, (C -Cιo)aryl group, a sulfide containing 1-8 carbon atoms and (C 3 -C 10 )heterocyclic group; and salts thereof; with the proviso that the compound of formula I does not consist solely of glycolic acid, oxalic acid, acetic acid, hydraacrylic acid, pyruvic acid, glyceric acid, 3-hydroxypyruvic acid, malonic acid, 3-hydroxybutyric acid, 2-methyllactic acid, 2-hydroxybutyric acid, 2- oxobutyric acid, isobutyric acid, butyric acid, malic acid, 2-oxovaleric acid, 2-hydroxyvaleric acid, 2-hydroxyvaleric acid, valeric acid, isovaleric acid, 2-methylvaleric acid, hexanoic acid, mercaptoacetic acid, thiolactic acid, 3-mercaptopropionic acid, thiopropionic acid, 3- mercaptopropionic acid, 2-bromopropionic acid, 2-bromobutyric acid, 2-chloropropionic acid, 3-chloropropionic acid, lactic acid or formic acid; and salts thereof. The present invention provides methods of attracting arthropods (e.g.. mosquitoes) comprising the step of exposing the environment with a composition comprising an effective amount of a compound of formula I wherein each X is independently H, halogen, OH, SH, oxo, ( -C 8 )alkyl group; each Y is independently H, (Cι-C 8 )alkyl group, Z is H, OH, SH, COOH, or (C,-C 8 )alkyl group; n is an integer between 1 and 10, inclusive; and salts thereof; and an effective amount of at least one compound from group II wherein group II compounds include a ketone having 3-10 carbon atoms, carbon dioxide, (C 2 -Cιo)alkene. (Ci- Cιo)aldehyde, an alcohol having 1-8 carbon atoms, a halogenated compound containing 1-8 carbon atoms, a nitrile containing 2-4 carbon atoms, an ether containing 3-10 carbon atoms, (C 6 -Cιo)aryl group, a sulfide containing 1-8 carbon atoms and (C 3 -Cιo)heterocyclic group; wherein any one or more of the (C 5 -Cιo)aryl group or (C 3 -Cιo)heterocyclic group may be substituted at any one or more positions with a substituent selected from the group consisting of H, oxo, halogen, OH, SH, COOH, COO(Cι-C 8 )alkyl group, (C C 8 )alkyl group, (Cι-C 8 )alkyl sulfide, O-(C,-C 8 )alkyl; (C r C 8 )alkyl group, and NR]R 2 wherein R, and R 2 are each independently selected from the group consisting of ( -C 8 )alkyl and H; and salts thereof; wherein the composition is effective to attract arthropods. The present invention entails blends of compounds that have not been previously combined, in either volume or composition for attracting mosquitoes. The novel combination of compounds of the present invention serve as effective arthropod attiactants. The novel compositions of the present invention may be more effective than humans as arthropod attractants. It has surprisingly been discovered that the compositions of the present invention are effective in attracting arthropods, e.g., mosquitoes. In addition, it has surprisingly been discovered that compositions of the compounds of formula I and the compounds of group II exhibit a synergistic effect in attracting arthropods, e.g., mosquitoes. This synergistic effect, in many cases, enables the compositions of the present invention to attract arthropods as well as, or better than humans. In addition, the compositions of the present invention obviate the need, in many cases, for the use of carbon dioxide in arthropod traps. DETAILED DESCRIPTION OF THE INVENTION The following definitions are used, unless otherwise described: halo is fluoro, chloro, bromo, or iodo. Alkyl, denotes both straight, cyclic and branched groups; but reference to an individual radical such as "propyl" embraces only the straight chain radical, a branched chain isomer such as "isopropyl" being specifically referred to. Aryl denotes a phenyl radical or an ortho-fused bicyclic carbocyclic radical having about nine to ten ring atoms in which at least one ring is aromatic. Heterocyclic encompasses a radical attached via a ring carbon of a monocyclic ring containing five or six ring atoms consisting of carbon and one to four heteroatoms each selected from the group consisting of non-peroxide oxygen, sulfur, and N(X) wherein each X is absent (e.g., -N=) or is H, O, (Cι-C )alkyl, phenyl or benzyl, as well as a radical of an ortho- fused bicyclic heterocycle of about eight to ten ring atoms derived therefrom, particularly a benz-derivative or one derived by fusing a propylene, uimethylene, or tetramethylene diradical thereto. As is well understood in the art, substitution of compounds and groups may be highly desirable for effecting either physical (e.g., volatility, melting point, softening point, viscosity, molecular weight and size, solubility, hydrophilicity, oleophilicity, and the like) or chemical properties. Where a substituent is referred to as a "group," that term implies that the compound may be substituted or not within the practice of the present invention. Where the substituent is referred to as a moiety or without any qualification, no substitution is contemplated. For example, alkyl group is inclusive of methyl, ethyl, propyl, butyl, isopropyl, octyl, dodecyl, cyclohexyl, 1-chlorobutyl, 2-hydroxypentyl, 4-cyanobutyl, and the like. On the other hand, and alkyl moiety or an alkyl would include only such substituents as methyl, ethyl, propyl, butyl, isopropyl, octyl, dodecyl, and cyclohexyl. Similarly, reference to a material as a compound having a central nucleus of a stated formula would include any compound, with any substituent, which did not alter the bond structure of the shown formula. It will be appreciated by those skilled in the art that compositions of the present invention will comprise one or more compounds that have one or more chiral centers. Such compounds may exist and be isolated as optically active and racemic forms. Some compounds may exhibit polymorphism. It is to be understood that the present invention encompasses any racemic, optically-active, polymorphic, or stereoisomeric form, or mixtures thereof, of a compound of the invention, that possesses the useful properties described herein, it being well known in the art how to prepare optically active forms (for example, by resolution of the racemic form by recrystallization techniques, by synthesis, from optically-active starting materials, by chiral synthesis, or by chromatographic separation using a chiral stationary phase) or using other tests which are well known in the art. Specific and preferred values listed below for radicals, genera, chemicals, substituents, and ranges, are for illustration only and they do not exclude other defined values or other values within defined ranges for the radicals, genera, chemicals and substituents. It is appreciated that "arthropod" is a member of the phylum Arthropoda. which is the largest phylum in the animal kingdom, comprising about 75% of all animals that have been described. The estimated number of arthropod species is between 1,000.000 and 2,000,000. Arthropods vary in size from the microscopic mites to the giant decapod crustaceans. The phylum Arthropoda includes many families of insects that are of a medical and veterinary importance, e.g., mosquitoes (Culicidae), blackflies (Simuliidae), sand fies (Phlebotominae), biting midges (Ceratopogonidae), horseflies (Tabanidae), tsetse flies (Glossinidae), stable flies and house flies (Muscidae), fleas (Siphonaptera), lice (Anoplura), triatomine bugs (Triatominae), soft ticks (Argasidae) and hard ticks t xodidae). A specific Arthropoda is mosquitoes (Culicidae), blackflies (Simuliidae), sand flies (Phlebotominae), biting midges (Ceratopogonidae), horseflies (Tabanidae), tsetse flies (Glossinidae), stable flies and house flies (Muscidae), fleas (Siphonaptera), lice (Anoplura), triatomine bugs (Triatominae), soft ticks (Argasidae) and hard ticks (Ixodidae). It is appreciated that "mosquito" can be any of the mosquitoes belonging to the suborder diptera known as Nematocera. This suborder includes the family Culicidae. The 3400 or so species of mosquitoes are arranged in 38 genera. The Culicidae are divided into three subfamilies: the Anophelinae, including the well-known genus Anopheles, many species of which are responsible for the transmission of malaria; the Toxorhynchitinae, the large larvae of which eat other mosquito larva; and the Culicinae which, with about 2930 species in about 34 genera, are divided into two tribes: the Culicini and the Sabethini. The Culcine mosquitoes include such well known genera as Culex, Aedes and Mansonia. The sebethene mosquitoes include Sabethes, Wyeomyia and Malaya. A specific mosquitoe is the genera Culex, Aedes, Psorophora, Wyeomyia, Mansonia, Coquilletidia or Anopheles. A specific arthropod is a mosquito belonging to the genera Culex, Aedes, Mansonia, Wyeomyia, Psorophora, Coquilletidia or Anopholes. Another specific arthropod is Simulidae, Triatoninae, Siphonaptera, Tabanidae, Culicoides, Phleobotomines, Muscidae, Glossinidae, Ixodidae or Argasidae. Specifically, (Cι-C 8 )alkyl can include, for example, methyl, ethyl, propyl, isopropyl, butyl, iso-butyl, sec-butyl, pentyl, sec-pentyl, iso-pentyl, hexyl, sec-hexyl, iso-hexyl, heptyl, sec-heptyl, iso-hectyl and octyl. A specific (Cι-C 8 )alkyl is methyl, ethyl, propyl, isopropyl, butyl, iso-butyl, sec-butyl, pentyl, sec-pentyl or hexyl. Another specific ( -C 8 )alkyl is methyl. Another specific ( - C 8 )alkyl is ethyl. Another specific ( -C )alkyl is propyl. Specifically (C -Cιo)aryl, for example, can be a central nucleus comprising phenyl, indenyl or naphthyl. A specific (C 6 -Cιo)aryl is phenyl. (C 6 -Cιo)aryl may optionally be substituted at any one or more positions with a substituent selected from the group consisting of H; oxo; halogen; OH; SH; COOH; COO(C C )alkyl; (C|-C 8 )alkyl; (Cι-C 8 )alkyl sulfide; NRιR 2 wherein Ri and R 2 are independently selected from H and (C]-C 6 )alkyl; and (Cι-C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen. In one specific embodiment, (C 6 -Cιo)aryl is substituted with CH 3 and OH. In another specific embodiment, (C 6 -Cιo)aryl is substituted with CH 3 . In another embodiment, (C 6 - Cιn)aryl is substituted with OH. In another embodiment, ( -Cιo)aryl is substituted with NH 2 . Another specific (C 6 -Cιo)aryl is p-cresol, benzonitrile, phenol or toluene. Another specific (C -Cιo)aryl is p-cresol. Another specific (C 6 -Cιo)aryl is benzonitrile. Another specific (C 6 -Cιo)aryl is phenol. Another specific (C 6 -Cιo)aryl is toluene (C 3 -Cιo)heterocycle may be substituted at any one or more positions with a substituent selected from the group consisting of H, oxo, halogen, OH, SH, COOH, COO( -C 8 )alkyl, (Cι-C 8 )alkyl, (Cι-C 8 )alkyl sulfide and ( -C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen. In one embodiment, (C 3 -Cιo)heterocycle is substituted with CH 3 . A specific (C 3 -Cιo)heterocycle is furan, azole, dioxane, thiophene, thiazole or triazole. A specific (C 3 -Cιo)heterocycle is furan. Specifically, X is H, halogen, OH, SH, oxo, ( -C 8 )alkyl, or (C C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen. A specific X is H. Another specific X is halogen. Another specific X is OH. Another specific X is SH. Another specific X is oxo. Another specific X is (Cι-C 8 )alkyl. Another specific X is (Cι-C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen. Another specific X is CH 3 . Specifically, Y is H, (Cι-C 8 )alkyl, or (Cι-C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen, or Y is absent when X is oxo. A specific Y is H. Another specific Y is (Cι-C 8 )alkyl. Another specific Y is (Cj- C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen. Another specific Y is Y being absent. Specifically, Z is H, OH, SH, COOH, (C,-C 8 )alkyl, or (C,-C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH. SH and halogen. A specific Z is H. Another specific Z is OH. Another specific Z is SH. Another specific Z is COOH. Another specific Z is (Cι-C 8 )alkyl. Another specific Z is ( -C )alkyl substituted with at least one substituent selected from the group consisting of H, OH. SH and halogen. Specifically, n is an integer between 1 and 10, inclusive. A specific value for n is 1. Another specific value for n is 2. Another specific value for n is 3. Another specific value for n is 4. Another specific value for n is 5. Another specific value for n is 6. Another specific value for n is 7. Another specific value for n is 8. Another specific value for n is 9. Another specific value for n is 10. The volatile component of skin extracts or hair extracts is the washings of skin or the washings of the shavings of hair, each blended with acetone or another suitable solvent. Although such washings of human skin or hair are not novel, the use of hair, saved hair or skin from an appropriate device not employing a shave cream can be mixed, or suspended in a suitable solvent as means to extract and release compounds attractive to arthropods. Many of the compounds found on hair are present due to skin oils, and in fact, shavings consist of both hair and dead skin cells. The same volatiles identified in Bernier, Ph.D. dissertation, University of Florida, 1995; and Bernier, et al., Analytical Chemistry, Vol. 71, No. 1. January 1, 1999 are present on the hair and dead skin cells. Compounds of formula I will contain at least one carboxylic acid group. Particular carboxylic acids for use in the present invention include lactic acid, glycolic acid, thiolactic acid and tartaric acid. A specific compound of formula I is lactic acid. Another specific compound of formula I is glycolic acid. Another specific compound of formula I is thiolactic acid. Another specific compound of formula I is tartaric acid. The chain lengths on the alkyl groups in formula I, particularly those inclusive of the alcohols and ketones, are important because of the need for effective levels of volatility for the individual and mixed compounds of the compositions of the invention. If significantly higher molecular weight ketones (e.g., greater than or equal to ten carbon atoms) or significantly higher molecular weight alcohols were used, the compounds and their mixtures would have reduced volatility and would not be effective, particularly over a wide area, as the compounds would not volatilize in sufficient amounts to be effective attractants over a significantly wide area. Thus, it is not likely that the higher molecular weight compounds will exhibit a synergistic effect because only one compound will be relatively volatie. A specific compound of formula I is tartaric acid or an acceptable salt thereof. In such embodiment, the present invention is a composition comprising a combination of tartaric acid or an acceptable salt thereof; and at least one compound from group II wherein group II compounds include a ketone having 3-10 carbon atoms, (C 2 -Cιo)alkene, (Cι-Cιo)aldehyde, carbon dioxide, an alcohol having 1-8 carbon atoms, a halogenated compound containing 1-8 carbon atoms, a nitrile containing 2-4 carbon atoms, an ether containing 3-10 carbon atoms, carbon dioxide, (C -Cιo)aryl, a sulfide containing 1-8 carbon atoms and (C 3 -Cιo)heterocyclic; wherein any one or more of the (C 6 -Cιo)aryl or (C 3 -Cιo)heterocyclic may be substituted at any one or more positions with a substituent selected from the group consisting of H; oxo; halogen; OH; SH; COOH; COO(C,-C 8 )alkyl; (d-C 8 )alkyl; (C C 8 )alkyl sulfide; (C C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen; and NRιR 2 wherein Ri and R 2 are independently selected from the group consisting of H and (C,-C 8 )alkyl; and salts thereof (as defined for Group I, above). In another embodiment, the present invention is a composition comprising an effective amount of a combination of at least one compound of formula I wherein each X is independently H, halogen, OH, SH, oxo, ( -C )alkyl, or (C \ - C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen; each Y is independently H, (C]-C 8 )alkyl, or (Cι-C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen, or Y is absent when X is oxo; Z is H, OH, SH, COOH, (C,-C 8 )alkyl, or (C,-C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen; n is an integer between 1 and 10, inclusive; and salts thereof (as defined for Group I, above); and an effective amount of at least one compound from group II wherein group II compounds include a ketone having 3-10 carbon atoms, (C 2 -Cιo)alkene, (Cι-Cιo)aldehyde, an alcohol having 1-8 carbon atoms, a halogenated compound containing 1-8 carbon atoms, a nitrile containing 2-4 carbon atoms, an ether containing 3-10 carbon atoms, carbon dioxide, (C 6 -Cιo)aryl, a sulfide containing 1-8 carbon atoms and (C 3 -Cιo)heterocyclic; wherein any one or more of the (C 6 -Cιo)aryl or (C 3 -Cιo)heterocyclic may be substituted at any one or more positions with a substituent selected from the group consisting of H, oxo, halogen, OH, SH, COOH, COO(C,-C 8 )alkyl, (C,-C 8 )alkyl, (Cι-C 8 )alkyl sulfide and (C,- C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen; and salts thereof (as defined for Group I, above); with the proviso that the compound of formula I does not consist solely of glycolic acid, oxalic acid, acetic acid, hydraacrylic acid, pyruvic acid, glyceric acid, 3-hydroxypyruvic acid, malonic acid, 3-hydroxybutyric acid, 2-methyllactic acid, 2-hydroxybutyric acid, 2- oxobutyric acid, isobutyric acid, butyric acid, malic acid, 2-oxovaleric acid, 2-hydroxyvaleric acid, 2-hydroxyvaleric acid, valeric acid, isovaleric acid, 2-methylvaleric acid, hexanoic acid, mercaptoacetic acid, thiolactic acid, 3-mercaptopropionic acid, thiopropionic acid, 3- mercaptopropionic acid, 2-bromopropionic acid, 2-bromobutyric acid, 2-chloropropionic acid, 3-chloropropionic acid, lactic acid or formic acid; and salts thereof (as defined for Group I, above); wherein the composition is effective to attract mosquitoes. In the above embodiment, the compound of formula I includes one or more (e.g., 1, 2, or 3) compounds selected from the group consisting of glycolic acid: oxalic acid: acetic acid; hydraacrylic acid; pyruvic acid; glyceric acid 3-hydroxypyruvic acid; malonic acid; 3- hydroxybutyric acid; 2-methyllactic acid; 2-hydroxybutyric acid: 2-oxobutyric acid: isobutyric acid; butyric acid; malic acid; 2-oxovaleric acid; 2-hydroxyvaleric acid; 2-hydroxyvaleric acid; valeric acid; isovaleric acid; 2-methylvaleric acid; hexanoic acid; mercaptoacetic acid; thiolactic acid; 3-mercaptopropionic acid; thiopropionic acid; 3-mercaptopropionic acid; 2- bromopropionic acid; 2-bromobutyric acid; 2-chloropropionic acid; 3-chloropropionic acid; lactic acid and formic acid, in addition to one or more (e.g., 1, 2, or 3) compounds of formula I. It is appreciated that the compound of formula I may comprise two or more distinct compounds. In addition, one (or more) of the two or more distinct compounds of formula I may be one of the above-identified compounds. Moreover, any combination of the above- identified compounds is acceptable. In another embodiment, the present invention provides a composition comprising an effective amount of a combination of at least one compound of formula I wherein each X is independently H, halogen, OH, SH, oxo, ( -C 8 )alkyl, or ( - C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen; each Y is independently H, (Cj-C 8 )alkyl, or (Cι-C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen, or Y is absent when X is oxo; Z is H, OH, SH, COOH, (C,-C 8 )alkyl, or (C r C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen; n is an integer between 1 and 10, inclusive; and salts thereof (as defined for Group I, above); and an effective amount of at least one compound from group II wherein group II compounds include a ketone having 3-10 carbon atoms, carbon dioxide, (C 2 -Cιo)alkene, (C,- Cιo)aldehyde, an alcohol having 1-8 carbon atoms, a halogenated compound containing 1-8 carbon atoms, a nitrile containing 2-4 carbon atoms, an ether containing 3-10 carbon atoms, (C 6 -Cιo)aryl, a sulfide containing 1-8 carbon atoms and (C 3 -Cιo)heterocyclic; wherein any one or more of the (C 6 -Cιo)aryl or (C 3 -Cιo)heterocyclic may be substituted at any one or more positions with a substituent selected from the group consisting of H, oxo, halogen, OH, SH, COOH, COO(C,-C 8 )alkyl, (C,-C 8 )alkyl, (C,-C 8 )alkyl sulfide and (C,- C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen; and salts thereof (as defined for Group I, above); wherein the composition is effective to attract mosquitoes. Specifically, "ketone" is any compound containing one or more -C(C=O)C- groups. Particular ketones for use in the present invention will have between 3-10 carbon atoms, inclusive. More specifically, ketone can be acetone, butanone, 2- pentanone, 2-hexanone, 2-heptanone, 3-pentanone, 3-hexanone, 3-heptanone, 4-heptanone, 5- nonanone, 3 -methy 1-2 -butanone, 4-methyl-2-pentanone, 3-penten-2-one, 3-buten-2-one, 3- hydroxy-2-butanone, 2, 3-butanedione or 2, 4-pentanedione. A specific ketone is acetone. Another specific ketone is butanone. Another specific ketone is 2-pentanone. Another specific ketone is 2-hexanone. Another specific ketone is 2- heptanone. Another specific ketone is 3-pentanone. Another specific ketone is 3-hexanone. Another specific ketone is 3-heptanone. Another specific ketone is 4-heptanone. Another specific ketone is 5-nonanone. Another specific ketone is 3-methyl-2-butanone. Another specific ketone is 4-methyl-2-pentanone. Another specific ketone is 3-penten-2-one. Another specific ketone is 3-buten-2-one. Another specific ketone is 3-hydroxy-2-butanone. Another specific ketone is 2, 3-butanedione. Another specific ketone is 2, 4-pentanedione. Specifically, "alkene" is any compound containing at least one C=C group. Particular alkenes for use in the present invention contain between 2 and 10 carbon atoms, inclusive. Particular alkenes for use in the present invention include aliphatic or cyclic alkenes. In addition, particular alkenes for use in the present invention include linear or branched alkenes. Particular alkenes for use in the present invention include isoprene, 1-heptene, 1-octene and 1- nonene. A specific alkene is isoprene. Another specific alkene is 1-heptene. Another specific alkene is 1-octene. Another specific alkene is 1-nonene. Specifically, "alcohol" is any compound containing at least one C(OH) group. Particular alcohols for use in the present invention will have between 1 and 8 carbon atoms, inclusive. Particular alcohols for use in the present invention may be aliphatic or cyclic alcohols. Particular alcohols for use in the present invention may be branched or straight chained alcohols. Particular alcohols for use in the present invention include methanol, ethanol, l-hepten-3-ol and l-octen-3-ol. A specific alcohol is methanol. Another specific alcohol is ethanol. Another specific alcohol is l-hepten-3-ol. Another specific alcohol is l-octen-3-ol. Specifically, (Cι-Cιo)aldehyde is a compound containing at least one C(=O)H group and between 1 and 10 carbon atoms, inclusive. Particular aldehydes for use in the present invention include formaldehyde, acetaldehyde, butyraldehyde, isobutyraldehyde, nonanal and benzaldehyde. A specific aldehyde is formaldehyde. Another specific aldehyde is acetaldehyde. Another specific aldehyde is butyraldehyde. Another specific aldehyde is isobutyraldehyde. Another specific aldehyde is nonanal. Another specific aldehyde is benzaldehyde. Specifically, "halogenated compound" is any compound containing at least one C-X group wherein X is a halogen atom. The halogen may be fluorine, chlorine, bromine or iodine. It should be noted that one or more halogen atoms may be present in the halogenated compound. Particular halogenated compounds for use in the present invention include halogenated (C . -C 8 )alkyl such as methylene chloride, chloroform, carbon tetrachloride and bromoform. A specific halogenated compound is methylene chloride. Another specific halogenated compound is chloroform. Another specific halogenated compound is carbon tetrachloride. Another specific halogenated compound is bromoform. Specifically, "nitrile" is any compound containing at least one CN group. Particular nitriles for use in the present invention include acetonitrile, benzonitrile and phenylacetionitrile. A specific nitrile is acetonitrile. Another specific nitrile is benzonitrile. Another specific nitrile is phenylacetonitrile. Specifically, "ether" is any compound containing a C-O-C group. Particular ethers for use in the present invention will have between 3 and 10 carbon atoms, inclusive, particularly aliphatic compounds. A specific ether is diethyl ether. Specifically, "carbon dioxide" is represented by the formula CCj. The carbon dioxide used in the present invention may exist as a gas or a solid. Carbon dioxide will normally exist as a gas at standard temperature and pressure. However, the carbon dioxide may be solid carbon dioxide, i.e., dry ice, in which case the carbon dioxide will sublime and eventually enter into the atmosphere as a gas. Alternatively, carbon dioxide may be delivered directly or indirectly from a cylinder or similar dispensing device. In such a case, the flow of carbon dioxide used may be monitored. As such, dry ice may be added to the other chemicals or carbon dioxide may be bubbled into the other chemicals from a carbon dioxide source. It should be noted that both forms of carbon dioxide are equally effective. However, cost and convenience may necessitate that one form be used to the exclusion of the other. Specifically, "sulfide" is any compound containing at least one C-S group. Particular sulfides for use in the present invention will contain between 1 and 10 carbon atoms, inclusive and between 1 and 3 sulfur atoms, inclusive. Particular aliphatic sulfides for use in the present invention include carbon disulfide, dimethyl sulfide, diethyl sulfide, dimethyl disulfide, diethyl disulfide, methyl propyl disulfide, ethyl vinyl sulfide, dimethyl sulfoxide and dimethyl trisulfide. A specific sulfide is carbon disulfide. Another specific sulfide is dimethyl sulfide. Another specific sulfide is diethyl sulfide. Another specific sulfide is dimethyl disulfide. Another specific sulfide is diethyl disulfide. Another specific sulfide is methyl propyl disulfide. Another specific sulfide is dimethyl trisulfide. Another specific sulfide is ethyl vinyl sulfide. Another specific sulfide is dimethyl sulfoxide. Specifically, "oxo" is C(=O). In one embodiment, a composition of the present invention comprises a compound of formula I and comprises a compound of group II. In one embodiment of the present invention, a composition comprises a compound of formula I, wherein a compound of formula I is lactic acid and the composition comprises at least three compounds of group II, which are acetone, carbon dioxide and dimethyl sulfide. Those of skill in the art will recognize that suitable compositions are formed by combining the compound or compounds of formula I with the compound or compounds of group II. The order of addition should not effect the activity of the resulting composition. However, cost and convenience may necessitate certain compounds be added in a certain order. It was found that convenience and cost dictated that any gases employed be added to other gases or liquids. Additionally, any solids employed should be added to liquids. The resulting mixtures were used without further preparation, although mixing is optional for each mixture developed. In cases where compounds are sufficiently basic or acidic to form stable nontoxic acid or base salts, use of the compounds as salts may be appropriate. Examples of acceptable salts are organic acid addition salts formed with acids which form an acceptable anbn, for example, tosylate, methanesulfonate, acetate, citrate, malonate, tartarate, succinate, benzoate, ascorbate, α-ketoglutarate, and α-glycerophosphate. Particular inorganic salts of the present invention may also be formed, including hydrochloride, sulfate, nitrate, bicarbonate, and carbonate salts. Acceptable salts may be obtained using standard procedures well known in the art, for example by reacting a sufficiently basic compound such as an amine with a suitable acid affording a physiologically acceptable anion. Alkali metal (for example, sodium, potassium or lithium) or alkaline earth metal (for example, calcium) salts of carboxylic acids can also be made. Specifically, "environment" is the surrounding land, air or water (or any combination thereof). The environment (i.e., surrounding area) may contain arthropods (e.g., mosquitoes, biting midges, etc) such that an effective amount of the composition will attract a significant portion of the arthropods from the environment. Alternatively, the environment will not contain a significant amount of arthropods such that an effective amount of the composition will ensure that the composition will attract a significant portion of the arthropods subsequently existing in the environment, from the environment. In such an embodiment, the compositions of the present invention will prophylactically remove arthropods from tie environment. The compositions of the present invention may be added, in any form, to a commercial or home-made trap to enhance the collection of the arthropod. The composition may diffuse out or away from the trap with or without a gas stream (e.g., air, carbon dioxide, etc.) as a carrier. As used herein, a trap is a device that ensnares an arthropod. Effective traps include those disclosed in Example 10, Table 10. Suitable traps are commercially available from American Biophysics, East Greenwich, R.I; Bio Quip Products, Gardena, CA; John W. Hock Company, Gainesville, FL; and Bio Sensory, Inc., Windham Mills Technology Center, Wilimatic, CT. The compositions of the present invention may be delivered in vials or other sample containers. The compositions may exist as the chemical or chemicals of formula I in one vial or container, and the chemical or chemicals of the compound of group II in another separate vial or container. Alternatively, the composition may be blended together wherein the chemical or chemicals of formula I and the chemical or chemicals of the compound of group II may be blended together in one vial. The compositions, whether present in one or two vials, may optionally include a means of a controlled release. The compositions of the present invention may be delivered in the gas phase, such as by a compressed cylinder. In addition, the composition existing in the gas phase, may optionally be mixed or unmixed with an inert carrier gas. The efficacy of the compositions of the present invention in attracting arthropods, may be further enhanced by adding one or more of the chemical compositions of skin washings or hair washings as disclosed in Bernier, Ph.D. dissertation, University of Florida, 1995 or Bernier, et al., Analytical Chemistry, Vol. 71. No. 1, January 1, 1999. The efficacy of the compositions of the present invention in attracting arthropods, may be further enhanced by adding one or more of light, heat and moisture. It is appreciated that those skilled in the art recognize that the compositions of the present invention include one or compounds of the formula I and one or more compounds of group II compounds. The compound or compounds of formula I may comprise about 1% to about 99%,by weight, of the total composition. In addition, the compound or compounds of the group II compounds may comprise about 1% to about 99% of the total composition, by weight. Effective amounts or ratios of each compound forming the resulting composition as well as effective amounts of the resulting composition will depend upon the individual compound or compounds of formula I and the individual compound or compounds of group II. The amount of composition required for use will vary not only with the particular compounds selected but also with factors such as type of arthropod, weather conditions, the geographical area to be covered and the desired length of time in which the insects are to be attracted. All chemicals used were purchased commercially from, e.g., Aldrich & Fluka Chemical, Milwaukee, WI, and Lancaster Synthesis, Windham, NH. All publications and patents are incorporated by reference herein, as though individually incorporated by reference, as long as they are not inconsistent with the present disclosure. The invention is not limited to the exact details shown and described, for it should be understood that many variations and modifications may be made while remaining within the spirit and scope of the invention defined by the claims. The invention will now be illustrated by the following non-limiting Examples, wherein unless otherwise specified, the tests were conducted with approximately 75 6-8 day old nulliparous female A edes aegypti. The tests were conducted in an olfactometer (55 ftVmin airflow, 80°F, 60% R.H.) as described by Posey, J. Med. Entomol., 35, 330-334 (1998); and LA is lactic acid. Mosquitoes were allowed to settle at least one hour prior to testing. The olfactometer was cleaned after each battery of tests. Each battery consisted of three tests, conducted at 08:30, 1 1 :00 and 13:00 hours local time. Each of the three tests was conducted in a separate cage. The control consisted of identical sample delivery devices and conditions compared to that of the treatment side. Both the treatment and control ports were opened and closed simultaneously when inserting a new treatment/control. EXAMPLES Example 1 Table 1 illustrates the effectiveness (in percentage caught of 75 female mosquitos) of lactic acid alone and of acetone alone as attractants ϊor Aedes aegypti. It was shown that 200 μL lactic acid alone attracted an average of 26% of the mosquitoes. It was also shown that 500 μL acetone alone, evaporated from a 60 mm diameter glass petri dish, attracted an average of 51% of the mosquitoes. Table 1 Compounds Screened in the Olfactometer L-lactic acid response (%) with 200 μL of a 1 μg/1 μL methanolic solution, dried 3 minutes in a petri dish: 25 31 57 12 23 29 5 27 7 7 7 14 36 26 28 52 31 44 60 4 20 22 25 29 15 24 26 25 19 8 16 27 48 64 23 14 22 25 25 20 13 14 21 23 52 40 17 31 36 25 9 LA Avg: 1303/51 = 26%, n = 51 trials Acetone response (%) at 500 μL, plated on a small petri dish: 51 48 53 51 Acetone Avg: 203/4 = 51%, n = 4 trials Example 2 Table 2 illustrates the effectiveness of several classes of compounds (e.g., ketones, carboxylic acids, alcohols, halogenated compounds, aldehydes, alkenes, nitriles. heterocyclic, sulfides, ethers, etc.) as attractants for Aedes aegypti mosquitoes. In addition, Table 2 also illustrates the synergistic effectiveness of these compounds with lactic acid as attractants for mosquitoes. Table 2 Results of screening for compounds (high dose of 500 μL) with a mode of action similar to acetone are below. These compounds are also called "activators" or "activator 2" compounds where the number designation of activator denotes that those chemicals elicit different behaviors (e.g., probing, flight pattern) in attraction. Italicized numbers represent values or, when present, average values that capture greater than 50% of mosquitoes. (CK = check or control port): Example 3 Table 3 illustrates the effectiveness of analogues of lactic acid as attractants for mosquitoes. In addition, Table 3 illustrates the synergistic effectiveness of these compounds with acetone as attractants for mosquitoes. Table 3 Results of screening for compounds with a mode of action similar to lactic acid are below (also called "base" compounds for "base attractants"): Ace=acetone Example 4 Table 4 illustrates the effectiveness of humans for attracting A edes aegypti mosquitoes. Data were collected from September 1997 - June 1998. Table 4 Human subjects tested in the olfactometer (raw data, % attraction): D. Kline 72 83 74 85 78 81 68 86 Avg 78% K. Posey 70 67 55 79 78 Avg 70% U. Bernier 83 63 68 55 Avg 67% Example 5 Table 5 illustrates the effectiveness of several compositions as attractants for mosquitoes. Table 5 Various mixtures and items examined, and described containers: 9-spot well plates with <10 μL pure L-LA + 500 μL acetone 95% LA + acetone (four 8.9 mm diam. caps) 95% Dish: LA + chloroform Cap: 90:10 95% Dish: LA + CS 2 + chloroform; Cap to 20 ml scintillation vial: 90/10 94% LA + acetone (two 8.9 mm diam. caps) 94% LA + acetone + 100 μL methylene chloride 93% LA + acetone + ethanol 92% LA + acetone (one 8.9 mm diam. cap) - max 400 μL acetone per cap 92% LA + 300 μL 1-octene + acetone 92%, 89% 500 μL acetone (dish 1 ) + 200 μg LA (dish 2) 91 % 500 μL (75:25) + 200 μg LA 90% LA + acetone + 2-butanone 89% LA + acetone + 100 μL CS 2 89% LA + isoprene (8.9 mm diam. cap) 88% LA + acetone + 50 μL 3-pentanone 88% 500 μL (90: 10) acetone/dmds + 200 μg LA 55% 9-spot well plate with equal amounts of AMI components + LA 55% LA + 75:25 + acetonitrile 57% Dish: LA + CS 2 Cap: 90:10 57% 9-spot well plate with LA (wet) + acetone 86% 266 ng glycolic acid + 1 ml acetone 86% 500 μL AM 1 + 200 μg LA 55% 9-spot well plates with LA (wet) + 2 wells acetone 83% LA + acetone + 100 μL butanone 50% 500 μL (50:50) + 200 μg LA 79% LA + acetone + 100 μL acetonitrile 75% 9-spot well plates with 10 μL thiolactic acid + 2 wells acetone 73% D. Kline 4-day old worn sock 77% LA + 2-octanone + acetone <55% 500 μL AMI 47% 266 μg glycolic acid + LA dried 3 min 45% LA + 5-nonanone + acetone 44% Acetonitrile + tartaric acid 41% 500 μL (90% acetone + 10% dimethyl disulfide) 35% 500 μL (75:25) acetone/dmds 33% 500 μL (50:50) acetone/dmds 24% l-hepten-3-ol 7% 90:10, 75:25, and 50:50 refer to the ratio of acetone to dimethyl disulfide in the mixture. LA = lactic acid The default treatment for LA is 200 μg and for other chemicals, it is 500 μL of the compound, unless specified otherwise. The scintillation vial cap (1 W) has an inner diameter of 13.5 mm. The black autosampler (IB) vial caps have an inner diameter of 8.9 mm and can hold approximately 400 μL of liquid. AMI = attractant mixture 1 is formulated as follows: 100 ml acetone. 700 μL butanone, 5 μL 3-methyl-2-butanone, 10 μL 2-pentanone, 300 μL carbon disulfide, 10 μL dimethyl sulfide. 10 μL dimethyl disulfide, and 500 μL acetonitrile. Example 6 Table 6 illustrates the average values for the effectiveness of several compounds and combinations of compounds as attractants for Aedes aegypti. These data were obtained from formal screenings and formal randomized tests. Table 6 Average Values for Compounds and Compositions Tested for Attraction of Aedes aegypti W= White Cap, -1200 uL volume, B=Black Cap, -400 uL volume, but omission rate determined by exposed surface area, temperature, and chemical volatility. I=Insert, -225 uL volume. Numerical Doses have Units of ug for solids or uL for liquids-Numerical Entries without letter designation indicate experiments in a 60 mL glass petri dish. Doses without units are typically μg for bases and μL for activators. Crys denotes solid with 500 μg-2 mg sample mess. Data compiled only from "formal" screen tests and experiments with randomized design. Base Dose Activatorl Dose Activator 2 )ose Response Number Avg % of Tests LA 600 Acetone 500 96.9% LA 50W Acetone IB 96.4% ^ LA 20W Acetone IB 94.9% LA 50W Dimethyl Disulfide 1W 93.3% LA 200W 1,1 ,1 -Trichloroethane 4B 92.5% LA 200 Carbon Tetrachloride 500 92.0% LA 400 Acetone 1000 91.8% n=3 Carbon Tetrachloride 500 91.5% LA 600 Acetone 1000 91.1 % n=2 LA 100W Acetone 1W 91.0% LA 50W Methylene Chloride 11 90.8% LA 200 Acetone 500 Nitrogen 50 90.3% LA 200W Acetone 500 90.2% LA 200 Acetone 375 Dimethyl Disulfide 125 90.0% LA 400 Acetone 500 89.5% n=3 Base Dose Activatorl Dose Activator 2 Dose Response Number Avg % of Tests LA 10W Acetone IB 89.4% n=2 LA support Acetone 1500 89.3% n=2 LA 200 Acetone 1W 89.2% LA 200 Carbon Disulfide 500 89.0% Glycolic Acid crys Acetone IB 88.5% LA 200 Acetone 450 Dimethyl Disulfide 50 88.0% LA 100W Acetone 2B 87.7% LA 50 uL W Acetone 2B Pyruvic Acid 50 uL W 87.7% LA 200 Acetone 500 87.6% n=8 LA 10W Acetone 1W 87.4% LA 200W Carbon Tetrachloride IB 87.0% Methylene Chloride 500 87.0% LA 100W Acetone 4B 86.6% LA 50W Dimethyl Disulfide IB 86.6% LA 50W Methylene Chloride 1 W 86.5% LA 200W Carbon Dioxide 40 mL/min 86.0% n=3 LA 2W Acetone 1 W 85.9% LA 200 Dimethyl Disulfide 500 85.5% LA 200W Trichloroethylene 4B 85.5% LA 400W Acetone 4B 85.1% LA 200 AMI 500 85.0% LA 200 Acetone 1000 84.9% n=26 LA 50W Carbon Disulfide IB 84.7% LA 200W Methylene Chloride 4B 83.7% n=3 LA 100W Acetone IB 83.3% n=2 Base Dose Activatorl Dose Activator 2 Dose Response Number Avg % of Tests LA 50W Carbon Disulfide 1W 82.9% LA 50W Methylene Chloride I B 82.7% D-LA 200 Acetone 500 82.4% LA 200 3 -Methyl-2-Butanone 500 82.0% LA 200 Acetone 500 Glycolic Acid 266 82.0% Carbon Disulfide 500 82.0% LA 400W Acetone 2B 81.6% LA 2W Methylene Chloride 1W 81.3% LA 200W Dimethoxymethane I B 81.1% Glycolic Acid 266 Acetone 500 81.0% LA 200 Acetonitrile 500 81.0% LA 200 Butanone 500 81.0% LA 200W Butanone 2B 80.7% n=3 Methylene Chloride 1 W 79.8% n=2 Hand-L DK 79.5% n=5 LA 2W Acetone IB 79.2% LA 200 Acetone 250 Dimethyl Disulfide 250 79.0% LA 200 Dimethyl suflide 500 79.0% 3-Hydroxy-2- 500 Acetone 500 78.0% Butanone LA 200W Acetone 4B 77.6% n=13 LA 200W Methylene Chloride I B 76.8% n=79 LA 200W Trichloroacetonitrile IB 76.8% LA 50 uL W Acetone 4B Pyruvic Acid 50 uL W 76.7% Hand-L KP 76.6% n=4 Base Dose Activatorl Dose Activator 2 Dose Response Number Avg % of Tests LA 200W Chloroform I B 76.3% n=4 LA 200W Dimethyl Disulfide 1W 76.3% n=3 LA 200W Isoprene 4B 76.3% n=3 LA 200W Dimethyl Disulfide I B 76.1% n=80 LA 200 2-Pentanone 500 76.0% LA 200 Chloroform 500 76.0% LA 200W Methylene Chloride 1000 75.9% n=3 LA 200W Acetone 1W 75.0% n=108 LA 200W Thiophene IB 74.6% Hand-L UB 72.6% n=25 LA 200W Tetrachloroethylene 4B 72.1% LA 200W Chloroform 2B 71.4% n=4 LA 200W Chloroform 4B 70.7% n=3 LA 200 Methylene Chloride 500 70.0% LA 200W Acetone I B 69.6% n=32 LA 400W Acetone IB 69.4% Hand-R KP 69.2% n=5 LA 200W Acetone 2B 68.6% n=12 LA 200W 2-Hexanone IB 68.0% LA 200W Methylene Chloride 2B 68.0% n=3 Thiolactic 100 uL Acetone 500 68.0% Acid LA 2W Dimethyl Disulfide 1 W 67.2% LA 200 Dimethyl Trisulfide 500 67.0% Tartaric Acid 180 Acetone 500 67.0% Base Dose Activatorl Dose Activator 2 Dose Response Number Avg % of Tests LA 200W Isoprene IB 66.8% n=5 LA 200W Butanone I B 66.2% n=4 LA 200W Butanone 4B 66.1% n=3 LA 200 CO2 0.5 mL/min Air 50 mL/min 66.0% n=2 LA 200 MeOH 500 66.0% LA 50W Acetone 11 Dimethyl Disi 11 64.9% LA 200W Carbon Disulfide 2B 64.8% n=3 LA 200 4-Methyl-2-Pentanone 500 64.0% LA 200 Bromoform 500 64.0% LA 200W Acetone 11 Glycolic Acid crys-W 63.9% LA 2W Methylene Chloride 11 63.5% LA 50W Acetone 11 63.3% LA Phenylacetonitrile 500 63.0% Acetone 500 1 -Octene 500 63.0% LA 200W Dimethyl Disulfide 2B 62.3% n=3 LA 2W Methylene Chloride IB 62.3% LA 50W Dimethyl Disulfide 11 Carbon Disulf 11 61 .4% LA 2W Acetone 11 61.3% LA 10W Methylene Chloride 11 61.2% LA 200W 1 , 1 ,2-Trichloroethane 4B 59.1% LA 200 Toluene 500 59.0% Methylene Chloride 58.9% LA 200W Carbon Disulfide IB 58.8% n=4 LA 200W Isoprene IB 2-Hexanone I B 58.0% LA 2W Dimethyl Disulfide 11 57.0% Base Dose Activatorl Dose Activator 2 Dose Response Number Avg % of Tests LA 100W Acetone 11 56.8% Pyruvic Acid 50 uL Acetone 4B 56.7% Acetone 500 Nitrogen 50 56.5% LA 200W Carbon Disulfide 4B 56.2% n=4 LA 200W Acetone 90:10 I B Dimethyl Disulfu I B 56.0% LA 200 Diethyl Ether 500 56.0% Acetone 500 Isoprene 500 56.0% Acetone 500 55.8% n=3 LA 200 Ethanol 500 55.0% LA 200 Ethylvinyl Sulfide 500 55.0% Methylene Chloride 4B 54.3% n=3 LA 50W Acetone 21 54.2% LA 100W 54.1% LA 200 Diethyl Sulfide 500 54.0% LA 50W Acetone 11 Carbon Disulfide 11 53.2% LA 200W Furfuryl Alcohol IB 52.8% LA 200W Dimethyl Disulfide 4B 52.7% n=3 Chloroform 2B 52.6% n=3 LA 200W Phorone IB 52.2% LA 200 2-Methylfuran 500 52.0% LA 200W 6-Methyl-5-Hepten-2-one IB 52.0% LA 200W Acetone 81 52.0% LA 200 2-Hexanone 500 51.0% LA 200 3-Penten-2-one 500 49.0% LA 200 Diethyl Disulfide 500 49.0% Base Dose Activatorl Dose Activator 2 Dose Response Number Avg % of Tests LA 200W Acetone 21 48.0% LA 200 Benzonitrile 500 48.0% LA 200 5-Nonanone 500 47.0% LA 200W Acetone 41 47.0% n=2 AMI 500 47.0% LA 200 Acetophenone 500 46.0% LA 200 Linalool 500 46.0% Dimethyl Disulfide 1W 46.0% n=2 Methylene Chloride 2B 46.0% n=3 LA 200W 2,3-Butanedione IB 45.8% n=4 LA 10W Dimethyl Disulfide 11 45.2% LA 200W Acetone IB 2,3-Butanedione IB 45.0% 4^ O LA 200 Glycolic Acid 266 45.0% LA 200W Dimethoxymethane 11 44.4% LA 200W Methyl Butyrate IB 43.1% LA 200W Acetone 11 43.0% LA 50W Carbon Disulfide 11 42.7% LA 200 1 -Octene 500 42.0% LA 200 2-Heptanone 500 42.0% LA 200W Dimethyl Trisulfide IB 41.0% Tartaric Acid 180 Acetonitrile 500 41.0% LA 200W Isoprene 2B 40.5% n=4 Chloroform 4B 40.2% n=3 LA 200W 3-Buten-2-one IB 40.0% LA 200 Methylpropyl Disulfide 500 40.0% Base Dose Activatorl Dose Activator 2 Dose Response Number Avg % of Tests LA 50W Acetone 31 39.1% DL- crys Acetone 500 39.0% Mandelic Acid LA 200 3-Buten-2-one 500 39.0% LA 200 3-Hexanone 500 39.0% LA 200W 3-Pentanone IB 39.0% Chloroform IB 39.0% n=3 Acetone 4B 38.3% n=8 1 -Octene 500 38.0% 2,3-Butanedione 500 37.0% LA 200W 1 -Methylpyrrole IB 36.8% 2,3-Butanedione 2B 36.3% n=3 Methylene Chloride IB 36.3% n=79 LA 200 3-Heptanone 500 36.0% LA 200W 3-Hexanone IB 36.0% Dimethyl Disulfide 500 36.0% LA 10W Acetone 11 35.2% n=2 LA 200 3-Hydroxy-2-Butanone 500 35.0% Acetone 450 Dimethyl Disulfide 50 35.0% Acetone 1W 34.6% n=54 LA 2W Dimethyl Disulfide IB 33.8% Carbon Disulfide 4B 33.2% n=4 Acetone 375 Dimethyl Disulfide 125 33.0% Diethyl Disulfide 500 33.0% LA 200 FC43 500 32.3% Base Dose Activatorl Dose Activator 2 Dose Response Number Avg % of Tests Butanone 2B 32.1% n=3 LA 200 4-Heptanone 500 32.0% LA 200 Isobutanal 500 32.0% LA 200 p-Cresol 500 32.0% Dimethyl Sulfide 500 32.0% Linalool 500 32.0% LA 200 1 , 1 ,3 -Trichloroacetone 500 31.7% 3-Buten-2-one 500 31.0% Pyruvic Acid 50 uL 30.7% LA 200 Dimethylsulfoxide 500 30.0% LA 200 2,3-Butanedione 500 29.0% LA 200 Acetaldehyde 500 29.0% . to LA 200W Acetaldehyde IB 29.0% LA 200W Acetonitrile 4B 29.0% Dimethoxymethane 11 29.0% 2,3-Butanedione I B 28.7% n=3 LA 200 3-Pentanone 500 28.0% Butanone 500 28.0% Furfuryl Alcohol 500 28.0% LA 50W Dimethyl Disulfide 11 27.6% Acetone IB 27.2% n=26 LA 200 6-Methyl-5-Hepten-2-one 500 27.0% LA 200 27.0% n=54 Acetonitrile 500 27.0% Bromoform 500 27.0% Base Dose Activatorl Dose Activator 2 Dose Response Number Avg % of Tests Acetone 2B 26.9% n=6 Methyl Butyrate 500 26.8% Butanone 4B 25.9% n=3 Glycolic Acid crys-W 25.3% LA 200W Acetonitrile 2B 25.0% n=3 Diethyl Ether 500 25.0% LA 200W 2,3-Butanedione 2B 24.0% n=3 LA 200 2-Decanone 500 24.0% Acetone 250 Dimethyl Disulfide 250 24.0% Chloroform 500 24.0% Glycolic Acid crys-W Acetone 11 23.8% LA 200 l-Penten-3-one 500 23.0% ^ LA 200 Isoprene 500 23.0% 2,3-Butanedione 4B 23.0% n=3 Thiourea crys Acetone 1 W 22.6% Dimethyl Disulfide IB 22.4% n=80 LA 200W 2,3-Butanedione 4B 22.0% n=3 LA 200 Nonanal 500 21.5% n=2 Carbon Disulfide IB 21.5% n=3 Acetone 11 21.4% LA 200 Benzaldehyde 500 21.0% Dimethyl Trisulfide 500 21.0% Dimethoxymethane IB 20.3% Indole 500 mg Acetone 500 20.0% LA 200W 3,4-Hexanedione 4B 20.0% Base Dose Activatorl Dose Activator 2 Dose Response Number Avg % of Tests LA 200W 3-Penten-2-one IB 20.0% LA 200 1 -Heptene 500 19.0% l-Penten-3-one 500 19.0% Methylpropyl Disulfide 500 19.0% LA 50 uL W ' Pyruvic Acid 50 uL W 18.9% LA 200W Acetonitrile IB 18.8% n=4 Carbon Disulfide 2B 18.4% n=4 D-LA 200 18.1% Ethylvinyl Sulfide 500 18.0% Methyl Butyrate IB 17.1% Glycolic Acid 266 17.0% LA 200W 2,3-Hexanedione 4B 17.0% ^ ^. 2-Heptanone 500 17.0% 4-Heptanone 500 17.0% Acetone 500 Propanoic acid 500 17.0% LA 2W 16.8% n=3 LA 200W 5-Methyl-2-Hexanone IB 16.4% Dimethyl Disulfide 4B 16.3% n=3 LA 200W Glycolic Acid crys-W 16.2% Isoprene 2B 16.1% n=3 LA 200 2-Octanone 500 16.0% Phenylacetonitrile 500 16.0% LA 200W 15.8% n=195 2-Methylfuran 500 15.0% Diethyl Sulfide 500 15.0% Base Dose Activatorl Dose Activator 2 Dose Response Number Avg % of Tests Dimethyl Disulfide 2B 14.7% n=3 2-Decanone 500 14.0% 5-Nonanone 500 14.0% Isoprene 4B 13.6% n=3 2-Amino- 500 mg Acetone 500 13.2% pyridine LA 200W l-Penten-3-one IB 13.0% Isobutanal 500 13.0% LA 200 2-Nonanone 500 12.0% LA 200W Isobutanal IB 12.0% 3-Heptanone 500 12.0% 3-Pentanone 500 12.0% 4^ l-Λ Isoprene 500 12.0% Isoprene IB 1 1.8% n=3 3-Hydroxy-2- 500 1 1.0% Butanone 3-Penten-2-one 500 1 1.0% Nonanal 500 1 1.0% Methylene Chloride 11 10.1% LA 200W 5-Methyl-3-hexen-2-one I B 10.0% MeOH 500 10.0% Nonanal 500 10.0% DL-Malic Acid crys Acetone 1W 9.3% Butanone IB 9.3% n=4 LA 200 2-Methyl-3-Pentanone 500 9.0% Base Dose Activatorl Dose Activator 2 Dose Response Number Avg % of Tests LA 200 3 -Methy 1-2-Pentanone 500 9.0% LA 200 3-Nonanone 500 9.0% Tartaric Acid 180 9.0% 6-Methyl-5-Hepten-2-one 500 9.0% Acetophenone 500 9.0% Benzaldehyde 500 9.0% Ethanol 500 9.0% Acetonitrile 4B 8.7% n=3 1 ,4-Diaminobutane IB 8.6% LA 200W 6-Methyl-3,5-Heptadien-2- IB 8.2% one Dimethyl Disulfide 11 8.1% 4^ ON LA 200 1 -Nonene 500 8.0% 2-Nonanone 500 8.0% 2-Octanone 500 8.0% 2-Pentanone 500 8.0% 3-Methyl-2-Butanone 500 8.0% 3 -Methy 1-2-Pentanone 500 8.0% Acetaldehyde 500 8.0% LA 200 Butanal 500 7.0% Acetone 500 Butanal 500 7.0% Toluene 500 7.0% Succinic Acid crys Acetone 1 W 6.9% LA 200W 4-Hexen-3-one IB 6.7% 1 -Nonene 500 6.0% Base Dose Activatorl Dose Activator 2 Dose Response Number Avg % of Tests Butanal 500 6.0% Furfuryl Alcohol IB 5.4% LA 200 Formaldehyde 500 5.0% 1 -Heptene 500 5.0% p-Cresol 500 5.0% Glyoxylic 100 uL Acetone 1W 4.9% Acid LA 200W l-Octen-3-one IB 4.6% Thiolactic Acid 100 uL 4.0% 3-Nonanone 500 4.0% Benzonitrile 500 4.0% CO2 0.5 4.0% LA 200W 4-Decanone IB 3.2% 2-Hexanone 500 3.0% Dimethylsulfoxide 500 3.0% Propanoic acid 500 3.0% Acetone 11 2.9% LA 200W 2-Methyl-3-Octanone IB 2.5% Acetonitrile 2B 2.3% n=3 LA 200W Diethyl Phthalate IB 1.5% LA 200W 1 ,4-Diaminobutane IB 1.4% LA 200W Butanal IB 1.0% LA 200 Propanoic acid 500 1.0% 2-Methy 1-3 -Pentanone 500 1.0% 3-Hexanone 500 1.0% Base Dose Activatorl Dose Activator 2 Dose Response Number Avg % of Tests Acetonitrile I B 1.0% n=3 Formaldehyde 500 1 .0% LA 200W E-3-Nonen-2-one IB 0.0% 4-Methyl-2-Pentanone 500 0.0% ^ O Example 7 Table 7 Compounds and Compositions Tested for Attraction of Aedes albopictus Treatment % caught CO2 5mL/min (water immersed) 29.2 Glycolic Acid Crys./CO2 5 mL/min 65.8 DL-Mandelic Acid Crys./Thiophene IB 27.8 DLK-R Sock, 1 day old 64.4 LA 200 μg/2,3-Butanedione 500 IB 27.6 DLK-L Hand/C02 (5 mL/min) 60.6 LA 200 μg/Thiophene IB 27.0 LA 200 μg/CO2 5mL/min 57.5 Glycolic Acid Crys./Thiophene 1 B 26.8 DLK-L Hand 55.6 LA 200 μg/Acetone 1B/CO2 5mL/min 24.1 LA 200 μg/Glycolic Crys./CO2 5 mL/min 50.6 CO2 5mL/min 23.0 DLK-L Hand 49.3 LA 200 μg/CS2 l B/MeC12 IB 22.7 DLK-L Hand 45.8 LA 200 μg/CS2 l B/MeC12 IB 22.2 §LA 200 μg/CO2 5mL/min 45.2 LA 200 μg/MeC12 500 μL Dish 19.4 LA 200 μg/DMDS 1B/CO2 5 mL/min 16.2 LA 200 μg/CS2 1B/CO2 5mL/min 44.9 LA 200 μg/Thiophene 500 μL Dish 15.7 LA 200 μg/CO2 5mL/min 42.7 LA 200 μg/Acetophenone 1 B 15.1 LA 200 μg/Acetone 1B/CO2 5mL/min 40.3 Mushrooms from DLK Yard 13.7 LA 200 μg/DMDS 1B/CO2 5 mL/min 36.9 Garlic clove 13.7 LA 200 μg/CC14 1B/CO2 5mL/min 35.1 LA 200 μg/Phenylacetonitrile 1 B 12.5 CO2 5mL/min 34.6 LA 200 μg/Ethylvinyl Sulfide IB 12.5 LA 200 μg/CS2 500 μL Dish 33.8 LA 200 μg/CS2 lB/2,3-Butanedione IB 12.0 LA 200 μg/CC14 1 B 12.0 LA 200 μg/Chloroform IB 33.8 LA 200 μg/Diethyl Sulfide IB 11.9 LA 200 μg/2,3-Butanedione lB/MeC12 IB 33.3 LA 200 μg/MeC12 1B/CO2 5mL/min 32.9 LA 200 μg/CC14 lB/MeC12 IB 32.9 CO2 5mL/min 32.0 Treatment % caught LA 200 μg/4-Hexen-3-one IB 5.5 LA 200 μg 11.7 Mixture F2 lB/Butanal 1B/CS2 IB 5.3 LA 200 μg/Benzaldehyde IB 1 1.6 LA 200 μg/Methylbutyrate IB 5.3 LA 200 μg/Acetone 500 uL Dish 1 1.1 Mixture F2 lB/Butanol 1B/CS2 IB 5.1 CO2 5mL/min 11.1 LA 200 μg/CS2 1B/DMDS l B/Acet IB 4.7 LA 200 μg/Ethyl Acetate IB 10.8 LA 200 μg/1-Butanol IB 4.6 3-Hydroxy-2-Butanone lB/Thiophene IB 10.8 Pyruvic lB/Thiophene IB 4.5 Glyoxylic Acid 1 mL Dish/Thiophene IB 10.4 LA 200 μg/2-Methylfuran IB 4.2 CO2 5 mL/min (water immersed) 9.7 LA 200 μg/2,3-Hexanedione IB 4.2 LA 200 μg/2,3-Butanedione 1B/CO2 5mL/min 9.5 LA 200 μg/1 -Nonanal IB 4.2 Acetone 500 μL Dish 9.1 LA 200 μg/Nonanal 500 μL Dish 4.1 CS2 500 μL Dish/MeC12 500 μL Dish 8.9 LA 200 μg/3-Methyl-2-Pentaone IB 3.9 LA 200 μg 8.3 LA 200 μg/2-Pentanone IB 3.9 LA 200 μg/Isoprene IB 8.1 LA 200 μg/2-Decanone IB 3.8 LA 200 μg/2,3-Butanedione 500 μL Dish 8.1 LA 200 μg/4-Heptanone IB 3.7 ^Mixture FI IB 7.6 LA 200 μg/1 -Methy lpiperazine IB 3.7 ^LA 200 μg/Thiourea Crys. Dish 7.6 LA 200 μg/CS2 1B/DMDS IB 3.5 LA 200 μg/Benzonitrile IB 7.6 LA 200 μg/50:50 Acetone:DMDS IB 2.7 LA 200 μg/CS2 IB 7.1 LA 200 μg/3-Methyl-2-Butanone IB 2.7 LA 200 μg/l,l,2-Trichloroethane IB 7.0 LA 200 μg/3-Buten-2-one IB 2.7 Limburger Cheese (European) 6.8 LA 200 μg/2-Octanone IB 2.7 LA 200 μg/l-Octen-3-ol IB 6.8 LA 200 μg/Diethyl Disulfide IB 2.6 DL-Malic Acid Crys./Thiophene IB 6.8 LA 200 μg/Acetonitrile IB 2.6 CO2 5mL/min 6.8 LA 200 μg/6-Methyl-5-Hepten-2-one IB 2.6 1 ,4-Diaminobutane IB 6.8 LA 200 μg/DMDS 500 μL Dish 2.4 LA 200 μg/Nitromethane IB 6.6 LA 200 μg/Pyrazine lB 6.4 LA 200 μg/2-Nonanone IB 6.4 LA 200 μg/3-Nonanone IB 6.3 LA 200 μg/2-Hexanone IB 6.3 LA 200 μg/Toluene IB 1.5 LA 200 μg/Methylpropyl Disulfide IB 1.4 LA 200 μg/3-Heptanone IB 1.4 LA 200 μg/2-Methyl-3-Pentanone IB 1.4 LA 200 μg/2-Heptanone lB 1.4 LA 200 μg/2,4-Pentanedione IB 1.4 CO2 5mL/min (water immersed) 1.4 LA 200 μg/Butanal lB 1.3 LA 200 μg/5-Nonanone IB 1.3 LA 200 μg/l-Hexen-3-ol IB 1.3 LA 200 μg/1 ,4-Diaminobutane 1.3 LA 200 μg/Thiolactic Acid IB 0.0 LA 200 μg/3,4-Hexanedione 1 B 0.0 Key to abbreviations in Table: LA=L-Lactic Acid, CS2=Carbon Disulfide, MeC12=Methylene Chloride=Dichloromethane, DMDS=Dimethyl ^Disulfide, CC14=Carbon Tetrachloride, Crys.=Crystalline Solid, 1B=1 Black cap of approx. 400 mL volume, DLK=Dan Kline, -L=left hand or left sock, -R=right hand or right sock Example 8 Table 8 Compounds and Compositions Tested for Attraction of Anopheles albimanus Treatment % caught LA 200 μg/Thiophene I B 62.7 LA 200 μg/MeC12 500 μL dish 97.4 1,1 ,1-Trichloroethane 500 μL 61.0 DMDS 500 μL 97.3 LA 200 μg/MeC12 IB 58.7 LA 200 μg/DMDS 500 μL dish 92.5 Trichloroethylene 500 μL 57.9 LA 200 μg/MeC12 IB 92.0 LA 200 μg/Acetone 500 μL dish 57.0 Dimethyl Trisulfide 500 μL 91.8 CS2 500 μL 56.0 LA 200 μg/Acetone 500 μL dish 91.7 Methylbutyrate 500 μL 55.8 LA 200 μg/Acetone 500 μL dish 89.9 3-Pentanone 500 μL 53.9 LA 200 μg/Acetone 500 μL dish 83.0 Phorone 500 μL 50.6 4-Hexen-3-one 500 μL 79.2 DMDS I B 49.3 & Chloroform 500 μL 78.7 LA 200 μg/MeC12 IB 48.6 LA 200 μg/MeC12 1B 77.6 Butanone 500 μL 47.9 MeC12 500 μL 75.7 Furfuryl Alcohol 500 μL 46.7 CC14 500 μL 74.0 3-Buten-2-one 500 μL 45.2 Dimethyl Sulfide 500 μL 68.4 LA 200 μg/DMDS IB 44.7 Thiophene 500 μL 68.0 LA 200 μg/CS2 1 B 42.7 Trichloroacetonitrile 500 μL 65.3 Ethanethiol 500 μL 40.0 1,1,2-Trichloroethane 500 μL 64.4 LA 200 μg/Chloroform lB 39.5 MeC12 IB 64.4 DMDS lB/Thiophene IB 37.8 MeC12 IB 63.0 2-Methylfuran 500 μL 35.5 Benzaldehyde 500 μL 35.5 2-Methyl-3-Heptanone 500 μL 34.7 Diethyl Sulfide 500 μL 33.3 Example 8 Table 8 Compounds and Compositions Tested for Attraction of A nopheles alhimamis Treatment % caught LA 200 μg/Thiophene 1 B 62.7 LA 200 μg/MeCI2 500 μL dish 97.4 1 ,1,1-Trichloroethane 500 μL 61.0 DMDS 500 μL 97.3 LA 200 μg/MeC12 1 B 58.7 l.Λ 200 μg/DMDS 500 μL dish 92.5 Trichloroethylene 500 μL 57.9 LA 200 μg/MeC12 I B 92.0 LA 200 μg/Acetone 500 μL dish 57.0 Dimethyl Trisulfide 500 μL 91 .8 CS2 500 μL 56.0 LA 200 μg/Acetone 500 μL dish 91.7 Methylbutyrate 500 μL 55.8 LA 200 μg/Acetone 500 μL dish 89.9 3-Pentanone 500 μL 53.9 LA 200 μg/Acetone 500 μL dish 83.0 Phorone 500 μL 50.6 4-Hexen-3-one 500 μL 79.2 DMDS I B 49.3 Chloroform 500 μL 78.7 LA 200 μg/MeCI2 I 48.6 , LA 200 μg/MeC12 1 B 77.6 Butanone 500 μL 47.9 McC12 500 μL 75.7 Furfuryl Alcohol 500 μL 46.7 CCI4 500 μL 74.0 3-Buten-2-one 500 μL 45.2 Dimethyl Sulfide 500 μL 68.4 LA 200 μg/DMDS I B 44.7 Thiophene 500 μL 68.0 LA 200 μg/CS2 1 B 42.7 I richloroacetonitrile 500 μL 65.3 Ethancthiol 500 μL 40.0 1 ,1 ,2-Trichloroethane 500 μL 64.4 LA 200 μg/Chloroform 1 B 39.5 MeC12 I B 64.4 DMDS lB/Thiophene l B 37.8 MeC12 I B 63.0 2-Methylfuran 500 μL 35.5 Benzaldehyde 500 μL 35.5 2-Methyl-3-I leptanone 500 μl. 34.7 Diethyl Sulfide 500 μL 33.3 LA 200 μg/Dimethyl Sulfide I B 32.4 6-Methyl-3,5-Heptadien-2-one 500 μL 18.7 LA 200 μg/CC14 1 B 32.0 3,4-Hexanedione I B/Methylbutyrate IB 17.9 DMDS IB 31.5 Nitromethane 500 μL 17.3 2-Methyl-3-Octanone 500 μL 30.1 Tetrachloroethylene 500 μL 17.3 Acetone 500 μL 29.6 3-Methyl-2-Pentanone 500 μL 17.1 p-Cresol 500 μL 29.5 LA 200 μg/3-Butcn-2-one 1 B 17.1 l -Penten-3-one 500 μL 29.3 LA 200 μg/Butanone 1 B 16.0 Pyrazine 500 μL 29.3 3-Nonanone 500 μL 15.8 2-Octanone 500 μL 28.6 LA 200 μg/2-Thiopropane 1 15.8 Ethyl Acetate 500 μL 28.4 LA 200 μg/4-Hexcn-3-one 1 B 14.7 Mesityl Oxide 500 μL 28.4 Toluene 500 μL 13.5 DMDS I B 28.0 Isophorone 500 μL 13.3 DMDS I B 27.4 LA 200 μg/Acetone 1 B 13.3 2-Nonanone 500 μL 27.0 LA 200 μg/2-Methylfuran 1 B 13.0 LA 200 μg/DMDS I B 26.9 5-Nonanone 500 μL 12.7 FI Mixture 500 μL 26.4 Methylpropyl Disulfide 500 μL 12.3 6-Methyl-5-I Iepten-2-one 500 μL 26.0 Acetone 1 B 12.2 Butanone l B/Thiophene I 26.0 4-Hexen-3-one 1 B/Thiophene I B 12.0 Elhylvinyl Sulfide 500 μL 25.4 LA 200 μg/1 -Methylpyrrole 1 B 12.0 3-Octanone 500 μL 25.0 LA 200 μg/p-Cresol 1 B 12.0 3-Methyl-2-Butanone 500 μL 24.4 5-Methyl-3-Hexen-2-one 500 μL 1 1.8 l -Octen-3-ol 500 μL 24.0 5-Methyl-2-Hexanone 500 μL 1 1.7 l -Propanethiol 500 μL 24.0 3-Heptanone 500 μL 1 1.3 Butanone I B/DM DS I B 22.7 2-Pentanone 500 μL 10.8 Nitromethane 500 μL 22.1 LA 200 μg/5-Nonanone 1 B 21.1 2- hiopropane 500 μL 20.5 DMDS I B 20.5 2,4-Pentanedione 500 μL 19.4 2,6-Dimethyl-4-F leptanonc 500 μL 18.7 1 -Methylpyrrole 500 μL 10.7 2-Undecanone 500 μL 4.2 5-Methyl-3-Hexen-2-one 500 μL 10.7 l-Nonanol 500 μL 4.1 Acetone I B 10.7 LA 200 μg/I.thylvinyl Sulfide I B 4.1 DMDS 1 B/4-I lexen-3-one 1 B 10.7 2-Decanone 500 μL 4.0 t-3-Nonen-2-one 500 μL 10.7 LA 200 μg/2-Pentanone 1 B 4.0 3,4-llexanedione 500 μL 10.5 LA 200 μg/3-Pentanone 1 B 4.0 2-Heptanone 500 μL 10.4 LA 200 μg/Acetone 1 B 4.0 LA 200 μg/Λcetone 1 B 10.4 LA 200 μg/Acetophenone 1 B 4.0 3-Decanone 500 μL 9.3 LA 200 μg/Ally I Disulfide I 4.0 LA 200 μg/Acetone 1 B 9.3 Methylbutyrate 1 B/Furfuryl Alcohol B 4.0 LA 200 μg/3-Nonanone 1 B 9.2 6-Undecanone 500 μL 3.9 LA 200 μg/Λcetone 1 B 9.1 LA 200 μg/3-Heptanone 1 B 3.9 2.4-Pentanedione 500 μL 9.0 Benzonitrile 500 μL 3.8 LA 200 μg/Benzonitrile 1 B 8.9 LA 200 μg/2-Octanone 1 B 3.8 3-Hexanone 500 μL 8.3 Diethyl Disulfide 500 μL 2.8 i Butanone 1 B/4-Hexen-3-one I 8.1 2,3-Hexanedione 500 μL 2.7 LA 200 μg/2-Decanone I B 8.1 Acetic Acid 500 μL 2.7 4-Hcptanonc 500 μL 8.0 LA 200 μg/4-Heplanone I 2.7 Λcelophenone 500 μL 7.9 LA 200 μg/Diethyl Sulfide I B 2.7 LA 200 μg/Bcnzaldehyde 1 B 7.9 LA 200 μg/DMS I B 2.7 4-Decanone 500 μL 7.8 Pentane 500 μL 2.7 LA 200 μg/2-Nonanone 1 B 6.7 Thiourea Crys dish 2.7 Methyl Urea Crys dish 6.5 1 -Tetradecene 500 μL 1.4 1,1.3-TrichloiOacetone 500 μL 5.6 2,3-Butanedione 500 μL 1.4 2-Methyl-3-Pentanone 500 μL 5.3 LA 200 μg/2-1 leptanone 1 B 5.3 LA 200 μg/Ethyl Acetate 1 B 5.3 Methylbutyrate 1 B/5-Methyl-3-l lexen-2-one 1 B 5.3 DMDS 1 B 5.2 2-Hexanone 500 μL 4.3 2-Dodecanone 500 μL 1.4 LA 200 μg/2-Hexanone 1 B 0.0 3,4-Hexanedione 500 μL 1.4 LA 200 μg/2-Methyl-3-Pentanone I B 0.0 LA 200 μg 1 .4 LA 200 μg/3-I Icxanonc 1 B 0.0 LA 200 μg/4-Methyl-2-Pentanone 1 B 1.4 LA 200 μg/3-Methyl-2-Bulanone I B 0.0 Pyruvic Acid 500 μL 1.4 LA 200 μg/3-Methyl-2-Pentanone I B 0.0 1-Methylpiperazine 500 μL 1.3 LA 200 μg/Phenylacctonitile I B 0.0 2-Tridecanone 500 μL 1.3 LA 200 μg/Toluene 1 0.0 3-Hydroxy-2-Butanone 500 μL 1.3 Succinic Acid Crys dish 0.0 4-Methyl-2-Pentι.nonc 500 μL 1.3 Thiolactic Acid 500 μL 0.0 Butanal 500 μL 1.3 Glutaric Acid Crys dish 1.3 Glycolic Acid Crys dish 1.3 Glyoxylic Acid 500 μL 1.3 Indole 500 μL 1.3 LA 200 μg 1.3 LA 200 μg/3-Hydroxy-2-Butanone I B 1.3 LA 200 μg/Diethyl Disulfide I 1.3 I.Λ 200 μg/Mcthylpropyl Disulfide I B 1.3 LA 400 μg dish 1.3 Laurie Acid 500 μL 1.3 Phenylacetonitrilc 500 μL 1.3 2-Aminopyridinc 500 μL 0.0 Acetonylacetone 500 μL 0.0 ΛUyl Disulfide 500 μL 0.0 DL-Malic Acid Crys dish 0.0 DL-Mandelic Acid Crys dish 0.0 DMSO 500 μL 0.0 Formic Acid 500 μ! < 0.0 Isoprene 500 μL 0.0 I.Λ 200 μg 0.0 Example 9 Table 9 Formulation and Verification of the Best Blend (Note: - 10:1 Acetone:DMDS emission rate) 200 μg L-lactic acid ( 1 w) 8% vs. 200 μg L-lactic acid (lw) + 61% Acetone (3B) Acetone (3B) 12% vs. 200 μg L-lactic acid (lw) + 59% Acetone (3B) 200 μg L-lactic acid (lw) 28% vs. 200 μg L-lactic acid (lw) + 47% + Acetone (3B) Acetone (3B) + DMDS (IB) 200 μg L-lactic acid ( 1 w) 42% vs. 200 μg L-lactic acid (lw) + 54%* + Acetone (B) Acetone (1B ) + DMDS (II) * Notes: overall. 95.2% mosquitoes trapped. ~ 30 μL in DMDS (dimethyl disulfide) insert, giving emission of - 100: 1 Acetone:DMDS. Example 10 Table 10 Types of Traps Bed nets Bates type stable traps Cylindrical lard can traps No. 10 Trinidad trap Trueman & Mclver ramp trap Plexiglas trap Katό ' s dry ice trap DeFoliant & Morris conical trap Malaise trap Carbon dioxide light traps Fay-Prince carbon dioxide trap Sticky trap New Jersey light trap ACIS trap (Army Collapsible Insect Surveillance) CDC light trap Kimsey & Chaniotis trap EVS light trap Monk ' s Wood light trap U.S. Army solid state light trap (AMSS) Pfuntner light trap Star beam sticky light trap Cylindrical light trap Updraft light traps "Nozawa " trap "AS " trap UV light trap Flashing light trap Non-electrical light trap Haufe & Burgess trap Fay-Prince trap Wilton & Kloter cylinder trap Duplex cone trap Ikeshoji cylinder sound trap Ikeshoji & Ogawa cup trap Kanda et al. cylinder and lantern traps Heat traps Sugar-base attraction traps The synergistic attractant compositions of the present invention may be provided b\ any number of mechanisms and in different formats appropriate to particular types of usage. The main function of the formats and mechanisms is to provide release of the attractant over a period of time sufficient to attract arthropods (e.g.. mosquitoes) effectively, and especiallyto attract arthropods effectively to an available source of arthropod control material (e.g.. insecticide, pheromone. microbial agent) which is effective against mosquitoes, and the like, as described above. The compositions of the present invention may or may not comprise carbon dioxide. In the embodiment of the present invention wherein the composition does not comprise carbon dioxide, an additional benefit of the present invention is attained. In such an embodiment, highly-efficient, attractive blends for arthropod traps that do not require carbon dioxide are obtained. An additional benefit of the compositions of the present invention include the obviation for live baits. The mechanisms and formats will, of course, van' among the various compositions depending on the volatility, persistence, aerial stability, moisture sensitivity, and the like of the individual ingredients and compositions. Moisture, heat and light may optionally be added to the compounds of the present invention to enhance efficiency. The structures used to release the attractant compositions of the present invention could be as simple as a tray carrying the composition, a housed tray or other container carrying the compositions, timed release canisters or spray cans, absorbent materials retarding the release of the attractant (e.g.. fabric, paper, porous material, foam, absorbent polymer, super absorbent polymer [e.g.. the super absorbent acrylic polymers as described in U.S. Patent No. 5.679.364]. containers with semipermeable membranes, vented containers, and the like). The materials which would more activeh' attack the arthropods may be associated with the attractant (in a mixture) or may be located near the attractants so the chemicals do not adversely interact or react. In addition, combining the compositions of the present invention with an insecticide provides a means of local extermination, not requiring wide-disbursement of the insecticide. Addition of a slow release chemical mechanism, such as paraffin, or other suitable viscous chemical (e.g.. glycerol) provides a means to reduce the evaporation rates of the compositions.

Claims: What is claimed is: 1. A composition comprising: (A) an effective amount of at least one compound of formula I wherein each X is independently H. halogen. OH. SH. oxo. (C]-C )alkyl group: each Y is independently H. (C|-C 8 )alkyl group. Z is H. OH. SH. COOH. or (C,-C 8 )alkyl group: n is an integer between 1 and 10. inclusive: and salts thereof: and an effective amount of at least one compound from group II wherein group II compounds include a ketone having 3-10 carbon atoms, carbon dioxide, (C 2 -Cιo)alkene. (C Cιo)aldehyde. an alcohol having 1-8 carbon atoms, a halogenated compound containing 1-8 carbon atoms, a nitrile containing 2-4 carbon atoms, an ether containing 3-10 carbon atoms, (C 6 -Cιo)aryl group, a sulfide containing 1-8 carbon atoms and (C 3 -Cιo)heterocyclic group; wherein any one or more of the (C 6 -Cιo)aryl group or (C 3 -Cιo)heterocyclic group may be substituted at any one or more positions with a substituent selected from the group consisting of H. oxo, halogen. OH, SH, COOH. COO(Cι-C )alkyl group. (C]-C 8 )alkyl group. (Cι-C 8 )alkyl sulfide and (C,-C 8 )alkyl group: and salts thereof: wherein the composition is effective to attract arthropods: or (B) a composition comprising an effective amount of tartaric acid or an acceptable salt thereof; and an effective amount of at least one compound from group II wherein group II compounds include a ketone having 3-10 carbon atoms. (C 2 -Cιo)alkene. (Cι-Cιo)aldehyde. an alcohol having 1-8 carbon atoms, a halogenated compound containing 1-8 carbon atoms, a nitrile containing 2-4 carbon atoms, an ether containing 3-10 carbon atoms, carbon dioxide. group, a sulfide containing 1-8 carbon atoms and (C 3 -Cιo)heterocyclic group: wherein any one or more of the ( -Cio.aryl or (C 3 -Cιo)heterocyclic may be substituted at any one or more positions with a substituent selected from the group consisting of H. oxo. halogen. OH. SH. COOH. COO(C,-C 8 )alkyl group. (C,-C 8 )alkyl group. (C r C 8 )alkyl sulfide and (Cι-C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH. SH and halogen: and salts thereof; wherein the composition is effective to attract arthropods: or (C) a composition comprising an effective amount of at least one compound of formula I wherein each X is independently H. halogen. OH. SH. oxo. (C t - C 8 )alkyl substituted with at least one substituent selected from the group consisting of H. OH. SH and halogen; each Y is independently H, (Cι-C )alkyl, or (Cι-C )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen, or Y is absent when X is oxo; Z is H, OH, SH, COOH, (C r C 8 )alkyl. or (C C 8 )alkyl substituted with at least one substituent selected from the group consisting of H. OH, SH and halogen; n is an integer between 1 and 10, inclusive; and acceptable salts thereof; and an effective amount of at least one compound from group II wherein group II compounds include a ketone having 3-10 carbon atoms. (C 2 -Cio)alkene. (CpCιo)aldehyde. an alcohol having 1-8 carbon atoms, a halogenated compound containing 1-8 carbon atoms, a nitrile containing 2-4 carbon atoms, an ether containing 3-10 carbon atoms, carbon dioxide. (C -Cιo)aryl group, a sulfide containing 1-8 carbon atoms and (C 3 -Cιo)heterocyclic group: and salts thereof; with the proviso that the compound of formula I does not consist solely of glycolic acid, oxalic acid, acetic acid, hydraacrylic acid, pyruvic acid, glyceric acid. 3-hydroxypyruvic acid, malonic acid. 3-hydroxybutyric acid, 2-methyllactic acid. 2-hydroxybutyric acid. 2- oxobutyric acid, isobutyric acid, butyric acid, malic acid. 2-oxovaleric acid. 2-hydroxyvaleric acid. 2-hvdroxvvaleric acid, valeric acid, isovaleric acid, 2-methvlvaleric acid, hexanoic acid. mercaptopropionic acid, 2-bromopropionic acid, 2-bromobutyric acid, 2-chloropropionic acid, 3-chloropropionic acid, lactic acid or formic acid; and salts thereof; wherein the composition is effective to attract arthropods. 2. A composition comprising an effective amount of at least one compound of formula I wherein each X is independently H, halogen, OH, SH, oxo, (Cι-C 8 )alkyl group; each Y is independently H, (Cι-C )alkyl group, Z is H, OH, SH, COOH, or (C,-C 8 )alkyl group; n is an integer between 1 and 10, inclusive; and salts thereof; and an effective amount of at least one compound from group II wherein group II compounds include a ketone having 3-10 carbon atoms, (C 2 -Cιo)alkene, (Cι-Cιo)aldehyde, an alcohol having 1-8 carbon atoms, a halogenated compound containing 1-8 carbon atoms, a nitrile containing 2-4 carbon atoms, an ether containing 3-10 carbon atoms, (C 6 -Cιo)aryl group, carbon dioxide, a sulfide containing 1-8 carbon atoms and (C 3 -C10) heterocyclic group; wherein any one or more of the (C 6 -Cιo)aryl group or (C 3 -Cιo)heterocyclic group may be substituted at any one or more positions with a substituent selected from the group consisting of H, oxo, halogen, OH, SH, COOH, COO(C,-C 8 )alkyl group, (Q-C 8 )alkyl group, (Cι-C 8 )alkyl sulfide, ( -C 8 )alkyl group, and NR1R2 wherein Ri and R are independently selected from the group consisting of (Cl-Cδ)alkyl and H; and salts thereof; wherein the composition is effective to attract arthropods. 3. The composition of claim 1 wherein the arthropod is a mosquito belonging to the genera Culex, Aedes, Mansonia, Wyeomyia, Psorophora, Coquilletidia or Anopheles. 4. The composition of claim 1 wherein X is H, OH or CH 3 . 5. The composition of claim 1 wherein Y is H. 6. The composition of claim 1 wherein n is 1 or 2. 7. The composition of claim 1 wherein the compound of formula I is lactic acid, glycolic acid, thiolactic acid, tartaric acid or an acceptable salt thereof. 8. The composition of claim 1 wherein the compound of formula I is lactic acid or an acceptable salt thereof. 9. The composition of claim 1 wherein the ketone is acetone, 2-butanone, 2-pentanone, 2- hexanone, 2-heptanone, 3-pentanone, 3-hexanone, 3-heptanone, 4-heptanone, 5-nonanone, 3- methyl-2-butanone, 4-methyl-2-pentanone, 3-penten-2-one, 3-buten-2-one, 3-hydroxy-2- butanone, 2,3-butanedione or 2,4-pentanedione. 10. The composition of claim 1 wherein the alcohol is methanol, ethanol, l-octen-3-ol or 1- hepten-3-ol. 11. The composition of claim 1 wherein the halogenated compound is methylene chloride, chloroform, carbon tetrachloride or bromoform. 12. The composition of claim 1 wherein the nitrile is acetonitrile, benzonitrile or phenylacetonitrile. 13. The composition of claim 1 wherein the ether is diethyl ether. 14. The composition of claim 1 wherein (C 6 -Cjo)aryl is p-cresol, benzonitrile, phenol or toluene. 15. The composition of claim 1 wherein the sulfide is carbon disulfide, dimethyl sulfide, diethyl sulfide, dimethyl disulfide, diethyl disulfide, methyl propyl disulfide, ethyl vinyl sulfide, dimethyl sulfoxide or dimethyl trisulfide. 16. The composition of claim 1 wherein (C 3 -Cio)heterocyclic is 2-methylfuran. 17. The composition of claim 1 wherein (C 2 -Cιo)alkene is isoprene, 1-heptene, 1-octene or 1 -nonene. 18. The composition of claim 1 wherein the aldehyde is formaldehyde, acetaldehyde, butyraldehyde, isobutyraldehyde, nonanal α benzaldehyde. 19. The composition of claim 1 wherein formula I compounds comprise lactic acid and group II compounds comprise acetone and dimethyl disulfide. 20. The composition of claim 1 wherein formula I compounds comprise lactic acid and group II compounds comprise acetone, dimethyl sulfide and carbon dioxide. 21. The composition of claim 1 further comprising an effective amount of at least one volatile component of skin extract or hair extract. 22. A method of attracting arthropods comprising the step of exposing the environment with a composition comprising an effective amount of at least one compound of formula I wherein each X is independently H, halogen, OH, SH, oxo, (Cι-C 8 )alkyl group; each Y is independently H, (Cι-C )alkyl group, Z is H, OH, SH, COOH, or (Cι-C 8 )alkyl group; n is an integer between 1 and 10, inclusive; and salts thereof; and an effective amount of at least one compound from group II wherein group II compounds include a ketone having 3-10 carbon atoms, carbon dioxide, (C 2 -Cιo)alkene, (d- Cιo)aldehyde, an alcohol having 1-8 carbon atoms, a halogenated compound containing 1-8 carbon atoms, a nitrile containing 2-4 carbon atoms, an ether containing 3-10 carbon atoms, (C 6 -Cιo)aryl group, a sulfide containing 1-8 carbon atoms and (C 3 -Cιo)heterocyclic group; wherein any one or more of the (C-Cιo)aryl group or (C 3 -Cιo)heterocyclic group may be substituted at any one or more positions with a substituent selected from the group consisting of H, oxo. halogen, OH, SH, COOH, COO(C,-C 8 )alkyl group, (C,-C 8 )alkyl group, (Cι-C 8 )alkyl sulfide and (Cι-C 8 )alkyl group; and salts thereof; wherein the composition is effective to attract arthropods; or (B) a composition comprising an effective amount of tartaric acid or an acceptable salt thereof; and an effective amount of at least one compound from group II wherein group II compounds include a ketone having 3-10 carbon atoms, (C 2 -Cιo)alkene, (Cι-Cιo)aldehyde, an alcohol having 1-8 carbon atoms, a halogenated compound containing 1-8 carbon atoms, a nitrile containing 2-4 carbon atoms, an ether containing 3-10 carbon atoms, carbon dioxide, (C 6 -Cιo)aryl group, a sulfide containing 1-8 carbon atoms and (C 3 -Cιo)heterocyclic group; wherein any one or more of the (C -Cιo)aryl or (C 3 -Cιo)heterocyclic maybe substituted at any one or more positions with a substituent selected from the group consisting of H, oxo, halogen, OH, SH, COOH, COO(C,-C 8 )alkyl group, (C,-C 8 )alkyl group, (C,-C 8 )alkyl sulfide and (Cι-C )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen; and salts thereof; wherein the composition is effective to attract arthropods; or (C) a composition comprising an effective amount of at least one compound of formula I wherein each X is independently H, halogen, OH, SH, oxo, ( -C 8 )alkyl, or (Q- C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen; each Y is independently H, (Cι-C 8 )alkyl, or (Cι-C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen, or Y is absent when X is oxo; Z is H, OH, SH, COOH, (Cι-C 8 )alkyl, or (C,-C 8 )alkyl substituted with at least one substituent selected from the group consisting of H, OH, SH and halogen; n is an integer between 1 and 10, inclusive; and acceptable salts thereof; and an effective amount of at least one compound from group II wherein group II compounds include a ketone having 3-10 carbon atoms, (C 2 -Cιo)alkene, (Cι-Cιo)aldehyde, an alcohol having 1-8 carbon atoms, a halogenated compound containing 1-8 carbon atoms, a nitrile containing 2-4 carbon atoms, an ether containing 3-10 carbon atoms, carbon dioxide, (C 6 -Cιo)aryl group, a sulfide containing 1-8 carbon atoms and (C 3 -Cιo)heterocyclic group; and salts thereof; with the proviso that the compound of formula I does not consist solely of glycolic acid, oxalic acid, acetic acid, hydraacrylic acid, pyruvic acid, glyceric acid, 3hydroxypyruvic acid, malonic acid, 3-hydroxybutyric acid, 2-methyllactic acid, 2-hydroxybutyric acid, 2- oxobutyric acid, isobutyric acid, butyric acid, malic acid, 2-oxovaleric acid, 2-hydroxyvaleric acid, 2-hydroxyvaleric acid, valeric acid, isovaleric acid, 2-methylvaleric acid, hexanoic acid, mercaptoacetic acid, thiolactic acid, 3-mercaptopropionic acid, thiopropionic acid, 3- mercaptopropionic acid, 2-bromopropionic acid, 2-bromobutyric acid, 2-chloropropionic acid, 3-chloropropionic acid, lactic acid or formic acid; and salts thereof. 23. A method of attracting arthropods comprising the step of exposing the environment with a composition comprising an effective amount of at least one compound of formula I wherein each X is independently H, halogen, OH, SH, oxo, ( -C 8 )alkyl group; each Y is independently H, (C t -C 8 )alkyl group, Z is H, OH, SH, COOH, or (C,-C 8 )alkyl group; n is an integer between 1 and 10, inclusive; and salts thereof; and an effective amount of at least one compound from group II wherein group II compounds include a ketone having 3-10 carbon atoms, carbon dioxide, (C 2 -Cιo)alkene, Cιo)aldehyde, an alcohol having 1-8 carbon atoms, a halogenated compound containing 1-8 carbon atoms, a nitrile containing 2-4 carbon atoms, an ether containing 3-10 carbon atoms, (C -Cιo)aryl group, a sulfide containing 1-8 carbon atoms and (C 3 -Cιo)heterocyclic group; wherein any one or more of the (C 6 -Cιo)aryl group or (C 3 -Cio)heterocyclic group may be substituted at any one or more positions with a substituent selected from the group consisting of H, oxo, halogen, OH, SH, COOH, COO(Cι.-C 8 )alkyl group, (Q-C 8 )alkyl group, (Cι-C 8 )alkyl sulfide, (Cι-C 8 )alkyl group, and NR1R2 wherein R] and R 2 are independently selected from the group consisting of (Cl-C8)alkyl and H; and salts thereof. 24. The method of claim 22 wherein the arthropod is a mosquito belonging to the genera Culex, Aedes, Mansonia, Wyeomyia, Coquilletidia, Psorophora or Anopheles. 25. The method of claim 22 wherein X is H, OH or CH 3 . 26. The method of claim 22 wherein Y is H. 27. The method of claim 22 wherein n is 1 or 2. 28. The method of claim 22 wherein formula I compounds comprise lactic acid, glycolic acid, thiolactic acid, tartaric acid or an acceptable salt thereof. 29. The method of claim 22 wherein formula I compounds comprise lactic acid or an acceptable salt thereof. 30. The method of claim 22 wherein the ketone is acetone, 2-butanone, 2-pentanone. 2- hexanone, 2-heptanone, 3-pentanone, 3-hexanone, 3-heptanone, 4-heptanone, 5-nonanone, 3- methyl-2-butanone, 4-methyl-2-pentanone, 3-penten-2-one, 3-buten-2-one, 3-hydroxy-2- butanone, 2,3-butanedione or 2,4-pentanedione. 31. The method of claim 22 wherein the alcohol is methanol, ethanol, l-octen-3-ol or 1- hepten-3-ol. 32. The method of claim 22 wherein the halogenated compound is methylene chloride, chloroform, carbon tetrachloride or bromoform. 33. The method of claim 22 wherein the nitrile is acetonitrile, benzonitrile or phenylacetonitrile. 34. The method of claim 22 wherein the ether is diethyl ether. 35. The method of claim 22 wherein (C 6 -Cιo)aryl is p-cresol, phenol or toluene. 36. The method of claim 22 wherein the sulfide is carbon disulfide, dimethyl sulfide, diethyl sulfide, dimethyl disulfide, diethyl disulfide, methyl propyl disulfide, ethyl vinyl sulfide, dimethyl sulfoxide or dimethyl trisulfide. 37. The method of claim 22 wherein (C 3 -Cιo)heterocyclic is 2-methylfuran. 38. The method of claim 22 wherein (C2-Cιo)alkene is isoprene, 1-heptene, 1-octene or 1- nonene. 39. The method of claim 22 wherein the (Cι-Cιo)aldehyde is formaldehyde, acetaldehyde, butyraldehyde, isobutyraldehyde, nonanal or benzaldehyde. 40. The method of claim 22 wherein formula I compounds comprise lactic acid or an acceptable salt thereof and group II compounds comprise acetone and dimethyl disulfide. 41. The method of claim 22 further comprising an effective amount of at least one volatile component of skin extract or hair extract. 42. An attractant for mosquitoes comprising the composition of claim 1 added to a commercial or home-made trap.

Inventors: BARNARD DONALD R, BERNIER ULRICH R, BOOTH MATTHEW M, KLINE DANIEL L, YOST RICHARD A, BARNARD, DONALD, R., BERNIER, ULRICH, R., BOOTH, MATTHEW, M., KLINE, DANIEL, L., YOST, RICHARD, A.
Applicants: UNIV FLORIDA, US AGRICULTURE, THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY OF AGRICULTURE, UNIVERSITY OF FLORIDA
Application year: 2000
Main classification: A01N25
IPC codes: A01N27, A01N29, A01N31, A01N35, A01N37, A01N59