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Stoneflies - Plecoptera: Perlodidae of Gunnison County, Colorado
Isogenoides Nymph key to species

1a. Conspicuous denticles present along margins on ventral cusps of both mandiles.

1b. Conspicuous denticles present along margins on ventral cusps of right mandible only.

References

Baumann,RW, Gaufin,AR and Surdick,RF 1977 The stoneflies (Plecoptera) of the Rocky Mountains. Memoirs of the American Entomological Society 31, 1-208.

Good Links

Key to Isogenoides Females of Gunnison County
Key to Isogenoides Males of Gunnison County
Brown, Wendy S. 2004 Plecoptera or Stoneflies of Gunnison County, Colorado
www.gunnisoninsects.org