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iEastern-tailed blue butterfly
Image:Eastern-tailed blue butterfly.jpg Easter-tailed blue butterfly (male)
Conservation status
Common </div>
Scientific classification
Kingdom: Animalia Phylum: Arthropoda Class: Insecta Order: Lepidoptera Superfamily: Papilionoidea Family: Lycaenidae Genus: Everes Species: E. comyntas comyntas
Binomial name
Everes comyntas comyntas (Godart 1824)

Eastern-tailed blue (Everes comyntas comyntas) is a common butterfly of eastern North America. Males are generally blue on the upperside of their wings while females are lighter blue to brown or charcoal in coloring, but there are also varieties of purple and pink found in both sexes.<ref name="msu">* Eastern Tailed-Blue (Cupido comyntas). Butterflies and Moths of North America. Montana State University. Retrieved on 2006-10-05.</ref> The underside coloration ranges from bluish-white to tan. There are two or three (outermost one often faint) black to orange chevron-shaped spots on the rear of the hind wings and a trailing tail off the innermost of the spots. The butterfly is 13/16 to 1 1/8 inches (2.06 to 2.85 cm) wide with wings outstretched and slightly shorter in length.<ref name="Glassberg">Glassberg, Jeffrey (2001). Butterflies of North America. New York: Sterling. ISBN 0760758654.</ref>

Eastern-tailed blue butterflies feed on various legumes and are known to secrete a substance which is favored by some ant species. The ant in turn protects the larva of the butterfly from other predators.

The butterfly is common across eastern North America, and is found as far south as Central America. The Great Plains form a habitat boundary between the Eastern-tailed and the much less common but similar Western-tailed blue butterfly. The central section of California and portions of the states of Oregon and Washington also has Eastern-tailed blues, which likely adapted to the habitat after being brought there inadvertantly by man. The species is virtually absent from the Rocky Mountain region. Often found in sunny, open habitat, the butterfly prefers clover, alfalfa and the seeds of various legumes.<ref name="msu"/>

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