|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.|
ReferencesKeys 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 LinksKey to Perlidae Nymphs
Key to Perlidae Males