Chilocorus stigma
Chilocorus stigma, commonly known as the twice-stabbed ladybug, is a native resident of the United States and Canada but does not live west of the Sierra Nevada.. It also has been introduced to Hawaii. It is shiny black, and there is one red spot on each elytron. The remainder of the body is black as well, but the abdomen is either yellow or red. It is sometimes confused with the "two-stabbed lady beetle", "Chilocorus orbus", which is widespread in California. Habitat and pests eaten. "C. stigma" mainly lives within terrestrial/arboreal habitats, primarily feeding on aphids  found in these habitats as well as scales (such as pine needle scale, beech bark scale and Florida red scale) and mealybugs. It is a beneficial insect, and is useful in both natural wood stands and commercial forests such as orchards and citrus groves. It is beneficial against non native species. An introduced Hemlock pest, the elongate hemlock scale ("Fiorinia externa" Ferris), which has been doing considerable damage to Hemlock trees throughout North America, can be moderately controlled by the presence of "C. stigma". "C. stigma" is currently not a lady beetle that can be sold for commercial use in  orchards or on farms. Life cycle and issues. "C. stigma" usually completes two lifecycles a year in Canada and the North United States but may complete several lifecycles a year further down South. They overwinter in ground litter during the colder months. "C. stigma" has been shown, like other ladybeetles, to be susceptible to the use of insecticides diminishing its population in the wild. In order to preserve the benefits of this insect, pesticide users are encouraged to use natural alternatives to pesticide in order to curb the decline of "C. stigma". Chromosome variation. The chromosomes (karyotype) of "Chilocorus stigma