Family: Lycaenidae, Gossamer-wing Butterflies view all from this family
Description The Western Tailed-blue (Cupido amyntula) is a member of the Lycaenidae family and is seen across western North America as far norther as Alaska. The upperside of the male butterfly is blue while the female has a darker brown band on the outer side of the wing. The underside is riddle with black spots, with a wingspan of 2.2 to 2.9 cm. The larvae feed on Thermopsis, Astragalus, Oxytropis, Vicia, and Lathyrus.
Dimensions 7/8-1 1/8" (22-28 mm).
Habitat Canyons & caves, Cities, suburbs & towns, Deserts, Forests & woodlands, Freshwater swamps, marshes & bogs, Grasslands & prairies, Meadows & fields.
Range Western Canada, Alaska, California, Northwest, Southwest, Rocky Mountains, Texas, Plains.