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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Weevils
This common name refers to only one family. Click its scientific name to learn more.
Beetle Family Curculionidae
These are often called Weevils.
I haven't listed all of the genera in this huge beetle family of 60,000 species; just the one(s) I've found being eaten by trout.
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.