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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.

Updates from July 21, 2005

Photos by Troutnut from the Rush River in Wisconsin

On-stream insect photos by Troutnut from the Rush River in Wisconsin

Closeup insects by Bnewell from the Flathead River in Montana

Lepidoptera (Moths) Insect Adult
I have been told this is the only western aquatic moth, Petrophila confusalis, see here on milkweed blossoms.
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