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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Updates from October 4, 2010
Closeup insects by Bnewell from the Touchet River in Washington
Updates from September 4, 2010
Closeup insects by Bnewell from the Touchet River in Washington
Updates from July 30, 2010
Closeup insects by Bnewell from the Flathead River and Flathead Lake in Montana
This species is very abundant in Flathead and Whitefish Lakes with a smaller population in lakes of the Swan River Drainage, and a few in Lake McDonald in Glacier Park. This species usually emerges along with Ephemera simulans.
Updates from July 19, 2010
Closeup insects by Bnewell from the Vermillion River and Miscellaneous Montana in Montana
This species was previously know only from the nymph. I reared nymphs and we described the adults and eggs of this interesting species.
Water mites are common in lakes and ponds but because they are so small they do not get noticed.These specimens are from temporary wetlands in Glacier National Park.
Updates from July 8, 2010
Closeup insects by Bnewell from the Kwethluk River in Alaska
This is probably Isoperla petersoni, a very common Perlodid stonely in Alaska streams.