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 pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.
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Litobrancha on May 19, 2007May 19th, 2007, 6:44 pm EDT
probably polycentropus, like earlfisherman said a good closeup of the anal claws would be helpful. esp any teeth or serrations on said claws. nice pics.
Creno on Dec 22, 2007December 22nd, 2007, 10:21 am EST
I think I can imagine I see the X at the base of the abdominal proleg claw. If so, and its size, support your decision that it is Polycentropus.