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Stoneflies - Plecoptera: Capniidae of Gunnison County, Colorado
Male key to Genera

1a. Vein R1 of forewing curved anteriorly just past origin.
1b. Vein R1 of forewing straight or flat at origin.
2a. Epiproct forked, with one process over other in same plane.
2b. Epiproct not forked

3a. Cerci with less than (<) 11 segments.
3b. Cerci with more than (>) 11 segments.

Good Links

Key to Capniidae Nymphs
Key to Female Capniidae
Brown, Wendy S. 2004 Plecoptera or Stoneflies of Gunnison County, Colorado