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.

The "Fountain Flats" stretch of the Firehole was fishable in the morning after an uncharacteristically cold August night.

From the Firehole River in Wyoming

Stream photos

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Onocosmoecus (Great Late-Summer Sedge) Caddisfly Larva Onocosmoecus (Great Late-Summer Sedge) Caddisfly Larva

Lateral view of a Onocosmoecus (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Larva from the Yakima River in Washington

This specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.

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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 Rhithrogena virilis Mayfly Dun Pictures

I'm guessing this one is Rhithrogena virilis based on collection of a male spinner of similar size and body configuration during the same trip.

Lateral view of a Female Rhithrogena virilis (Heptageniidae) Mayfly Dun from the South Fork Snoqualmie River in Washington

Female Rhithrogena virilis (Heptageniidae) Mayfly Dun from the South Fork Snoqualmie River in Washington

Dorsal view of a Female Rhithrogena virilis (Heptageniidae) Mayfly Dun from the South Fork Snoqualmie River in Washington

Ventral view of a Female Rhithrogena virilis (Heptageniidae) Mayfly Dun from the South Fork Snoqualmie River in Washington

Ruler view of a Female Rhithrogena virilis (Heptageniidae) Mayfly Dun from the South Fork Snoqualmie River in Washington The smallest ruler marks are 1/16".

This mayfly was collected from the South Fork Snoqualmie River in Washington on June 16th, 2018 and added to Troutnut.com by Troutnut on June 23rd, 2018.

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