INTRODUCTION
Little information has been published on Stenella spp. from the western South Atlantic Ocean.  Numerous references (Lahille, 1899 and 1905; Beddard, 1900; van Beneden and Gervais, 1880 ; Figueira, 1894 ; and others—see text) exist citing the long-snouted dolphin, S. longirostris, in Brazil, Uruguay, and Argentina, but none of these reports are confirmed with specimens.  A single report of S. attenuata in this area is an unconfirmed mention from Cape Horn (Beddard, The holotype of the striped dolphin, S. coeruleoalba, was collected some- 1900). where around the mouth of the Rio de la Plata (River Plate) between Uruguay and Argentina (Meyen, 1833). Since that time only three additional specimens have been reported from this region (Malm, 1871; and Praderi, In : Ximencz, et al., 1972). The purpose of this note is to provide information on museum specimens of Stenella spp. in Uruguay and Argentina. We will also discuss the older references of S. longirostris in western South Atlantic waters.
MATERIALS A
The present study is based on the examination of the cetacean collections in five South American museums.  These are : Museo Argentino de Ciencias Nat- urales " Bernardino Rivadavia ", Buenos Aires, Argentina (MACNBA); Musco de La Plata, La Plata, Argentina (MLP); Museo Nacional de Historia Natural de Montevideo, Uruguay (MNHNM); Museu Nacional do Zoologia de la Uni- versidad de Sao Paulo, Brazil (MZSP); and Museu Nacional do Rio de Janeiro, Brazil (MNRJ).  No specimens of Stenella were found in either of the Brazilian museums.
SPECIES ACCOUNTS
Stenella coeruleoalba—Fraser and Noble (1970) have concluded, based on pigmen- tation  patterns  of  specimens,  that several nominal species of Stenella ( Delphinus coerulealbus Meyen, 1833; D. marginatus Desmarest, 1855±1; D. euphrosyne, Gray 1846; D. styx, Gray, 1846; and  D. lateralis Peale, 1848) with a spinal blaze and eye-to-anus stripe (terminology of Mitchell, 1970) probably belong to one species, S. coeruleoalba Meyen, 1833).  Hubbs et al. (1973) have stated that their records of S. coeruleoabla  across the tropical Pacific supports the view " that  the northern and far-southern populations of this species are conjoined and thus confirms the synonymy adopted by Fraser and Noble (1970)." We have examined two S. coeruleoabla specimens: (1) a skull (MNHNM 1305) from Balneario Solymar, Depto. de Canelones, Uruguay (34°49′S., 55°55′W), Rio de la Plata; and (2) a skull (MACNBA 2625) from Miramar, Pcia.   Buenos Aires, Argentina (38°17'S.) Atlantic Ocean. The cranium from Punta Jose Ignacio, Uruguay that Praderi reported in Ximenez et al. (1972) was not avail- able to us. The only skull measurements available for this species from the type locality are those of Meyen (1833) and Malm (1871 : 63, holotype of Clymenia burmei- steri).  Cranial dimensions in millimeters and dental counts of the two speci- mens we examined of S. coeruleoalba are presented in Table 1. No additional information is available for the Miramar specimen.  The Solymar skull was collected from a stranded specimen by Praderi on 23 August 1959.  The total length of the carcass (notch to tip of lower jaw) was 242 cm.  The specimen was a male. Stenella spp.—Various scientific names are currently used for spotted dol- These include S. attenuata (Gray, 1846) in the Pacific, Indian, and phins. Atlantic Oceans, and S. dubia (G. Cuvier, 1812); S. frontalis (G. Cuvier, 1829), and S. plagiodon (Cope, 1866) in the Atlantic.  There are probably only two valid species (Perrin, 1975). We examined one skull that can be referred to the spotted dolphin complex. This specimen (MACNBA 23-46) is from Mar del Plata, Pcia.  Buenos Aires, Argentina (38°00'S.) Atlantic Ocean.1 -The date of collection was 1923, but no additional information is available for this specimen. Skull measurements and dental counts of this specimen are presented in Table 1. ' The skull is illustrated in Plate 1. Stenella longirostris—This species was described as Delphinus longirostris from an unknown locality (Gray, 1828).  Van Bree (1971) stated that the com¬ plete synonymy proposed by Hershkovitz (1966: 37-40) is probably correct, but "' much more must be known before definite conclusions can be drawn about the taxonomic status and nomenclature of Stenella longirostris."  This species has been reported from both sides of the tropical Atlantic Ocean (Moore, 1953; Cadenat and Doutre, 1959 ; Layne, 1965 ; van Bree, 1971 ; Caldwell et al., 1971 ; and van Halewijn and van Bree, 1972).  We found no specimens referable to
Sci. Rep. Whales Res. Inst.,
No. 28, 1976.
S. longirostris in five eastern South American museums. As noted in the introduction, numerous authors have reported S. longirostris and the probably conspecific nominal species (see van Bree, 1971) Delphinus alope and D. microps from localities including Brazil, Uruguay, Argentina and Cape Horn. All southern " records" are without documented specimens or observations. In view of this confusion, we present below the genesis and chronological review of western South Atlantic " records " for this species. Gray (1866) reported Delphinus alope from " Cape Horn ", but the specimen is apparently now not extant in the British Museum (Natural History) and no Sci. Rep. Whales Res. Inst., No. 28, 1976. additional information is available in the museum on the collection locality of this specimen (W. F. Perrin, per. comm., 1973). Based on the valid records of S. longirostris, this species is known worldwide only in tropical waters.   It is extremely unlikely that S. longirostris will ever be recorded from the cold¬ temperate waters of southern South America. In fact, this species is still not known from any of warm-temperate waters of the world. The reports of this species from Chilean waters by Schneider (1946) and Mann (1957) are without any type of documentation and should be discounted. The "records" of Gray (1866), Schneider (1946) and Mann (1957) are probably what influenced Marcuzzi and Pilleri (1971) to map the erroneous distribution of S. longirostris around Cape Horn, Gray's comments (1850 : 126, 1866 : 240 and 1871 : 69) are all apparently based on one specimen of Delphinus microps from the " coast of Brazils " from Dr. Dickie's collection. This specimen was probably collected in the tropical waters somewhere north and east of Rio de Janeiro. Burmeister (1867 and 1879) provided the following accounts about D. microps: (1867) " vive en el alto mar Atlantico al sud del ecuador y se presenta muchas veces a los viajeros en buques de velas. Tenemos en el Museo Publico dos craneos completos, el uno regalado por el Sr. Dr. D. Miguel Olaguer Feliu", (We could not find either of these skulls in the museum, MACNBA.) and (1879) " on trouve cette espece dans l'Ocean Atlantique, principalement au sud de l'Equateur, par troupes de 20 a 30 individus. Ils suivent quelquefois la marche du navire et passent en bondissant a son avant. Je les ai apercus et etudies plusieurs fois pendant les quatre voyages que j'ai faits dans cette partie de l'Ocean. (Voyez mon voyage du Bresil, page 37, Berlin 1853)". Van Beneden and Gervais (1880) cited D. microps from the mouth of the Rio de la Plata and the coast of Brazil. They provided no new data and probably just followed the above statements by Gray and Burmeister. Figueira (1894) noted that "Delphinus microps Gray. Tonina. Es una de las especies mas comunes en nuestras costas sobre el Rio de la Plata, especialmente en los meses de Noviembre a Febrero". Tonina is used today in Uruguay by laymen for Tursiops cf. truncatus and this is what Figueira's records of D. microps must have been. Lahille only noted the following : (1899) "Delphinus delphis Linneo. Esta especie (D. microps Burm, nec Gray) se ha notado en las costas del Chubut," and (1905) "Prodelphinus longirostris. Cabo de Buena Esperanza, Australia; Costas de la Provincia de Buenos Aires". Carcelles (1948) stated that "Prodelphinus longirostris Cuvier, Habita tambien el litoral atlantico bonaerense, asi como las Islas Galapagos, Panama, Australia. En el Museo de la Estacion Hidrobiologica de Puerto Quequen, puede verse un modelo en yeso del craneo".
RESUMEN
Se proporcionan medidas y detalles de 3 especimenes de delfinidos del genero Stenella del Oceano Atlantico Sudoccidental. Se cita por primera vez para esta
Sci. Rep. Whales Res. Inst.,
No. 28, 1976.
area un ejemplar del " spotted species complex " . Se mencionan tambien 2 especimenes de S. coeruleoalba, I de Uruguay y l de Argentina, de las proximidades de la localidad tipica (desembocadura del Rio de la Plata). De S. longirostris no se encontraron ejemplares en ninguna de las colecciones de 5 museos sudamericanes (ver Materials) del cual tampoco existen datos de especimenes documentados en la literatura, citados para el Oceano Atlantico Sudoccidental.
ACKNOWLEDGMENTS
We are indebted to the following for allowing us to examine specimens in their care :  Jorge  Crespo  and  Elisa  Kantis  (MACNBA);  Raul  Aramburu  (MLP); Miguel A. Klappenbach (MNHNM); Paulo Vanzolini (MZSP); and Dalcy de Albuquerque (MNRJ).  William F. Perrin provided valuable information and Perrin and P.J.H. van Bree read the manuscript and provided useful criticism.
REFERENCES
Beddard. F.E., 1900. A book of whales. John Murray, London. 320 p. BENEDEN, P.J. VAN, and P. GERVAIS, [1868-1880]. Osteographie des cetaces vivant et fossiles comprenant la description et iconographic du squelettc et du systeme dentaire de ces animaux ainsi que des documents relatifs a leur histoire naturelle. Arthus Bertrand, Paris. 634 p., 68 pl. BREE, P. J. H. VAN, 1971. On skulls of Stenella longirosiris (Gray, 1828) from the castern Atlantic. (Notes on Cetacea, Delphinoidea IV.). Beaufortia, 19: 21-25. Burmeister, G., 1867. Fauna Argentina. Mammifera Pinnata Argentina. An. Mus. Publico B. Aires, 1(7): 301-311. Burmeister, H., 1879. Description physique de la Republique Argentine. Animaux Vertebres. lere. Partie. Mammiferes vivants et eteints. Avec Atlas, 3: 1-555. CADENAT, J., and M. Doutre, 1959. Notes sur les Delphinides ouest-Africans. V. Sur un Prodelphinus a long bec capture au large des cotes du Senegal Prodelphinus longirostris (Gray) 1828? Bull. I. F. A. N. Ser. A 21(2): 787-792. CALDWELL, D.K., M.C. CALDWELL, W.F. RATHJEN, and J.R. SULLIVAN, 1971. Cetaceans from the Lesser Antillean Island of St. Vincent. Fish. Bull., 69(2): 303-312. Carcelles, A., 1948. Los cetaceos en las aguas argentinas. Rev. Mus. Arg. Cienc. Nat., Publ. Extra, 238: 5-10. FIGUEIRA, J. H., 1894. UContribucion a la fauna Uruguaya. J Enumeracion de Mamiferos. An. Mus. Nac. Montevideo, Ser. I, L: 187-217. FRASER, F.C., and B.A. NOBLE, 1970. Variation of pigmentation pattern in Meyen's dolphin, Stenella coeruleoalba (Meyen). In: G. Pilleri [ed.], Investigations on Cetacea, Vol. 2, p. 147-163. GRAY, J.E., 1828. Spicilegia zoologica; or original figures and short systematic descriptions of new and unfigured animals. Treuttel, Wurtz and Co. and W. Wood, London. Gray, J. E., 1850.  Catalogue of the specimens of Mammalia in the collection of the British Museum. Part I. Cetacca. Trustees, British Museum, London. 153 p. Gray, J.E., 1866. Catalogue of seals and whales in the British Museum. Trustees, British Museum, London. 402 p. Gray, J. E., 1871.  Supplement to the Catalogue of seals and Whales in the British Museum.  Trustees, British Museum, London. 103 p. HALEWIJN, R., and P.J.H. VAN BREE, 1972.  On the occurrence of the common dolphin, Sci. Rep. Whales Res. Inst., No. 28, 1976. BROWNELL AND PRADERI 134 Delphinus delphis, and the spinner dolphin, Stenella longirostris, off the coast of Venezuela. In. G. Pilleri [ed.], Investigations on Cetacea, Vol. IV, p. 187-188. HERSHKOVITZ, P., 1966. Catalog of living whales. U.S. Nat. Mus. Bull., 246: 1-259. HUBBS, C. L., W. F. PERRIN, and K. C. BALCOMB, 1973. Stenella coeruleoalba in the eastern and central tropical Pacific. J. Mammal., 54: 549-552. Lahille, F., 1899. Ensayo sobre la distribucion geografica de los mamiferos de la Republica Argentina. Prim. Reun. Congr. Cient. Lat. Amer., 3 : 165-206. LAHILLE, F., 1905. Las ballenas de nuestros mares, sus costumbres y aprovechamiento. Rev. Jard. Zool. Buenos Aires, 1(1): 28-82. LAYNE, J.N., 1965. Observations on marine mammals in Florida waters. Bull. Fla. State Mus., 9 (4): 131-181. MALM, A.W., 1871. Hvaldjur I sveriges museer ar 1869. Kongl. Svenska Vetensk. Akad. Handl, 9(2): 1-104. Mann, F. G., 1957. Clave de determinacion para las especies de mamiferos silvestres de Chile. Invest. Zool. Chilenas, 4: 89-104. Marcuzzi, G., and G. Pilleri, 1971. On the zoogeography of Cetacea. In: G. Pilleri [ed.], Investigations on Cetacea, Vol. III, p. 101-170. MEYEN, F. J. F., 1833. Beitrage zur Zoologie, gesammelt auf einer Reise um die Erde. Nov. Act. Acad. Caes. Leop. Carol. Nat. Curios., 16(2): 551-610. Pigmentation pattern evolution in delphinid cetaceans: an essay in MITCHELL, E., 1970. adaptive coloration. Canadian J. Zool., 48: 717-740. Amer. Midl. Nat., Moore, J.C., 1953. Distribution of marine mammals in Florida waters. 49(1): 117-158. Perrin, W. F., 1975. Variation of spotted and spinner porpoise (genus Stenella) in the eastern tropical Pacific and Hawaii, Scripps Inst, of Oceanogr, Bull, 21, 181 p. Schneider, C.O., 1946. Catalogo de los mamiferos de la Provincia de Concepcion. Bol. Soc. Biol. (Concepcion), 21 : 67-83. XIMENEZ, A., A. LANGGUTH, and R. PRADERI, 1972. Lista sistematica de los mamiferos del Uruguay. An. Mus. Nac. Hist. Nat. Montevideo, 2 Serie, 7(5): 1-49.
PLATE I Fig. 1. Stenella sp. referred to the spotted dolphin complex (see text). This specimen (MACNBA 23-46) is from Mar del Plata, Pcia. Buenos Aires, Argentina (38°00'S.) Atlantic Ocean. Dorsal view of specimen. Fig. 2. Stenella sp. (MACNBA 23-46) ventral view of specimen. Fig. 3. Stenella sp. (MACNBA 23-46) lateral view of specimen. Sci. Rep. Whales Res. Inst., No. 28, 1976.