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.

Female Hesperoperla pacifica (Golden Stone) Stonefly Adult Pictures

Lateral view of a Female Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Adult from the Henry's Fork of the Snake River in Idaho

Artistic view of a Female Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Adult from the Henry's Fork of the Snake River in Idaho

Ventral view of a Female Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Adult from the Henry's Fork of the Snake River in Idaho

Female Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Adult from the Henry's Fork of the Snake River in Idaho

The dark, hairless, sclerotized rectangle on the subgenital plate (in focus in this picture) is a key identifying characteristic for Hesperoperla pacifica.

Female Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Adult from the Henry's Fork of the Snake River in Idaho

Dorsal view of a Female Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Adult from the Henry's Fork of the Snake River in Idaho

Ruler view of a Female Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Adult from the Henry's Fork of the Snake River in Idaho The smallest ruler marks are 1 mm.

This stonefly was collected from the Henry's Fork of the Snake River in Idaho on August 1st, 2020 and added to Troutnut.com by Troutnut on August 17th, 2020.

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