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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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Psychodidae True Fly Larva Psychodidae True Fly Larva

Lateral view of a Psychodidae True Fly Larva from Mystery Creek #308 in Washington

This wild-looking little thing completely puzzled me. At first I was thinking beetle or month larva, until I got a look at the pictures on the computer screen. I made a couple of incorrect guesses before entomologist Greg Courtney pointed me in the right direction with Psychodidae. He suggested a possible genus of Thornburghiella, but could not rule out some other members of the tribe Pericomini.

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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.

Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Updates from June 7, 2021

Updates from June 7, 2021

Photos by Troutnut

Closeup insects by Troutnut from the Teal River and the Namekagon River in Wisconsin

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Nyctiophylax affinis (Dinky Light Summer Sedge) Caddisfly Adult

Nyctiophylax affinis (Polycentropodidae) (Dinky Light Summer Sedge) Caddisfly Adult from the Teal River in Wisconsin

This specimen is certainly Nyctiophylax and most likely Nyctiophylax affinis. I don't know my caddisfly parts well enough to definitively follow the Nyctiophylax key in Morse (1972), but that source states that affinis is the predominant Midwestern species, being widespread and common in the region where I found this one. The anatomy of this one seems to match those at least as well as the other two potential options based on range, Nyctiophylax uncus and Nyctiophylax banksi.

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Male Dibusa angata (Microcaddis) Caddisfly Adult

Male Dibusa angata (Hydroptilidae) (Microcaddis) Caddisfly Adult from the Namekagon River in Wisconsin

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Male Mystacides (Black Dancer) Caddisfly Adult

Lateral view of a Male Mystacides (Leptoceridae) (Black Dancer) Caddisfly Adult from the Namekagon River in Wisconsin

5
Eurylophella (Chocolate Dun) Mayfly Nymph

Dorsal view of a Eurylophella (Ephemerellidae) (Chocolate Dun) Mayfly Nymph from the Namekagon River in Wisconsin

4
Stenonema (March Browns and Cahills) Mayfly Nymph

Dorsal view of a Stenonema (Heptageniidae) (March Browns and Cahills) Mayfly Nymph from the Namekagon River in Wisconsin

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Female Cheumatopsyche (Little Sister Sedge) Caddisfly Adult

Lateral view of a Female Cheumatopsyche (Hydropsychidae) (Little Sister Sedge) Caddisfly Adult from the Namekagon River in Wisconsin

This one has a body a little bit over 6 mm long.

9
Male Stenonema terminatum Mayfly Spinner

Male Stenonema terminatum (Heptageniidae) Mayfly Spinner from the Teal River in Wisconsin

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References

Morse, JC. 1972. The genus Nyctiophylax in North America. Journal of the Kansas Entomological Society 42(2): 172-181.

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