| Celastrina echo sidara (Clench, 1944) |
| Status: Uncommon local resident. |
| Flight Period(s): There is one spring flight from mid-May to early June. |
| Range: It has only been collected in the Pine Ridge area of Souix county. |
| Larval Hostplant(s): Larvae feed on the flowers of chockcherry (Prunusvirginiana). |
| Overwinter: As pupae. |
| Commentary/Habitat: This butterfly is found in association with its hostplants in the Pine Ridge of northwestern Nebraska. It has been found at Gilbert-Baker State Wildlife Management Area and Sowbelly Canyon, both in Sioux County. |
| Similar Species: Summer Azure |
