Blue-winged Olives
Baetis
Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
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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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Updates from December 18, 2009
Updates from December 18, 2009
Closeup insects by Bnewell from 6 Mile Creek and the Flathead River in Montana
This species resembles Drunella grandis but the spines tell the story.
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