Western Tailed Blue

Cupido amyntula (Boisduval, 1852)

Family: Lycaenidae

Status: Rare/extirpated? resident

NENHP Ranking: Not listed

Range: The Western Tailed-Blue is found from Alaska southeast into Minnesota and eastern Ontario, and south in the western United States through California and New Mexico. In Nebraska it has been found in the northwestern quarter of the state.

Broods/Flight Times: There is one primary flight, mainly in early June, with a partial second flight possible in early August.

Larval Hostplant(s): Various legumes are listed of which Slender Milkvetch (Astragalus flexuosus), Yellow Vetchling (Lathyrus ochroleucus), Purple Locoweed (Oxytropis lambertii), American Vetch (Vicia americana) are found in Nebraska.

Habitat: Open undisturbed areas

Found at:

Overwintering: As full-grown caterpillars

Similar Species: Eastern Tailed Blues


Western Tailed Blues, Photo by Matthew Brust
Western Tailed Blue – female, dorsal
Western Tailed Blue – female, ventral
Western Tailed Blue – male, dorsal
Western Tailed Blue – male, ventral

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