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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
Salmonflies
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

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.
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.

Kogotus Stonefly Nymph Pictures

This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.

Dorsal view of a Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
Ruler view of a Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington The smallest ruler marks are 1 mm.
Ventral view of a Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington

This stonefly was collected from Mystery Creek #199 in Washington on June 19th, 2023 and added to Troutnut.com by Troutnut on June 21st, 2023.


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Kogotus Stonefly Nymph Pictures

Collection details
Location: Mystery Creek #199, Washington
Date: June 19th, 2023
Added to site: June 21st, 2023
Author: Troutnut
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