Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York

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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Limnephilidae (Giant Sedges) Caddisfly Larva Limnephilidae (Giant Sedges) Caddisfly Larva

Dorsal view of a Limnephilidae (Giant Sedges) Caddisfly Larva from the Yakima River in Washington

This specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.

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27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.

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Updates from June 10, 2021

Closeup insects by Troutnut from the Teal River in Wisconsin

Female Hydatophylax argus (Giant Cream Pattern-Wing Sedge) Caddisfly Adult

12 Pictures

Lateral view of a Female Hydatophylax argus (Limnephilidae) (Giant Cream Pattern-Wing Sedge) Caddisfly Adult from the Teal River in Wisconsin

I had some trouble working through the genus key for this one because I'm not great at interpreting caddis wing venation. Fortunately, figure 19.707 in An Introduction to the Aquatic Insects of North America (Fifth Edition) shows the distinctive color pattern of the striking forewings on Hydatophylax argus, which is a perfect match for the pattern as well as venation. As there are no other species in that genus in this area, I can be pretty confident in the species ID.

Collected June 10, 2021 from the Teal River in Wisconsin

Added by Troutnut on June 12, 2021

Collected June 10, 2021 from the Teal River in Wisconsin and added by Troutnut on June 12, 2021