| 1a. Subgenital plate flat or not produced. Egg with apical reticulation.
Egg surface has a net like pattern on one end. |
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| 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. LinksKey to Perlidae NymphsKey to Perlidae Males |