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Western Tailed Blue

Viewpoint Rd, Crook Co, June 23

Western Tailed-Blue

Cupido amyntula

Size: 0.75 - 1.0 inches wingspan

Key ID features:  Male bright lavender blue above, female brown or gray-brown, with purple-blue iridescence when fresh. HW with white fringe and  often few or no marginal black spots. Below, gray or gray-white, with small black spots rimmed with white, variable marginal band of spots and chevrons, usually one small orange patch adjacent to small blue iridescent patch next to small white-tipped tails. Usually lacks the black cell-end bar on the upperside of the forewing.

Similar species: Eastern Tailed-Blue tends to be more gray below, often has more orange on HW below, is smaller, and usually has a black cell end bar on the FW above.


Host plant: Many species in the pea family including lupines, vetches and clovers.

Habitat: Typically found in native habitats, including wet meadows and riparian areas. ​

Range: West of the Cascade Range, Siskiyou and Klamath Mtns,  Ochoco Mtns, Wallowa Mtns and Blue Mtns.

Season: Late march to mid-September

Abundance: Common


Conservation Status: Secure

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