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Stoneflies - Plecoptera: Perlidae of Gunnison County, Colorado

Female key to Genera and species

1a. Subgenital plate flat or not produced. Egg with apical reticulation.
Egg surface has a net like pattern on one end.
1b. Subgenital plate protruding or produced.
2a. Subgenital plate with posteromesal square area of dark sclerotization; Egg collar stalked
2b. Subgenital plate without dark sclerotized area; Egg collar button-like; vagina lined with spinules.

References

Keys and illustrations modified from the following:
Stark,BP; Gaufin,AR 1976 The nearctic genera of Perlidae (Plecoptera). Miscellaneous Publications of the Entomological Society of America 10, 1-80.
Baumann,RW; Gaufin,AR; Surdick,RF 1977 The stoneflies (Plecoptera) of the Rocky Mountains. Memoirs of the American Entomological Society 31, 1-208.

Good Links

Key to Perlidae Nymphs
Key to Perlidae Males

Brown, Wendy S. 2004 Plecoptera or Stoneflies of Gunnison County, Colorado
www.gunnisoninsects.org