Species
Cupido amyntula (Western tailed-blue)
Cupido amyntula. Photo: (c) Nick Block, some rights reserved (CC BY)
The western tailed-blue (Cupido amyntula) is a member of the family Lycaenidae and is seen across western North America as far north 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 riddled with black spots, with a wingspan of 2.2 to 2.9 cm. The larvae feed on Thermopsis, Astragalus, Oxytropis, Vicia, and Lathyrus species.
Sightings
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