Salmonflies
Pteronarcys californica
The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
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This one seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.
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Ebony Salmonfly
This common name refers to only one species. Click its scientific name to learn more.
Stonefly Species Pteronarcys princeps
These are pretty much always called Ebony Salmonfly.
This species takes over for Pteronarcys californica at higher altitudes and smaller waters. Because of their habitat preferences, they never achieve the population densities of californica. This and their smaller size are the only differences as they are similar in both appearance and behavior.