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Cupido amyntula

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How to Identify Western Tailed Blue Mudpuddling

The western tailed-blue 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.
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