| 1a. Anterior black mark on head as long as wide, often extending posteriorly to medain ocellus; median pronotal stripe broad, little produced laterally on posterior margin; little or no pigmentation on pronotal rugosities; subgenital plate broadly rounded. | ![]() ![]() |
| 1b. Anterior mark on head twice as wide as long, not extending to median ocellus; median pronotal stripe much produced laterally at anterior and posterior margins; heavy pigmentation on pronotal rugosities; subgenital plate slightly emarginate.Triznaka pintada |
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ReferencesKey and drawings modified from: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 LinksKey to Male TriznakaKey to Female Triznaka |