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 seems to be a young larva of Limnephilus. Although not clear in the picture, several ventral abdominal segments have chloride epithelia.
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Updates from August 3, 2004
Photos by Troutnut
Closeup insects by Troutnut from Miscellaneous Wisconsin in Wisconsin
Updates from July 31, 2004
Photos by Troutnut
Closeup insects by Troutnut from Miscellaneous Wisconsin in Wisconsin
I've lost the date information for this specimen and taken a guess.
Updates from July 30, 2004
Photos by Troutnut
Closeup insects by Troutnut from the Bois Brule River and Miscellaneous Wisconsin in Wisconsin
This is an iridescent green terrestrial beetle. They're common in northern Wisconsin's forests during the middle of summer, and I found them on the water's surface more than any other terrestrial insect. I saw the trout take a few and caught some trout on an imitation.
Updates from July 28, 2004
Photos by Troutnut
Closeup insects by Troutnut from the Bois Brule River in Wisconsin
I captured this small caddisfly from one of many dense mating swarms under overhanging alder trees in a slow stretch of the river. There were localized rises of trout under the swarms.