| Cupido amyntula valeriae Clench, 1944 |
| Status: Rare resident |
| Flight Period(s): There is one primary flight, mainly in early June, with a partial second flight possible in early August. |
| 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. |
| 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. |
| Overwinter: As full-grown caterpillars |
| Commentary/Habitat: N/A |
| Similar Species: Eastern Tailed-Blue |
