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

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

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.
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.

Caddisfly Species Onocosmoecus unicolor (Great Late-Summer Sedges)

Where & when

Time of year : Mid-August to late October

Preferred waters: Rivers and lakes

This species is common in the Northwest and present but uncommon in the East.

In 83 records from GBIF, adults of this species have mostly been collected during August (35%), July (25%), September (22%), and October (11%).

In 55 records from GBIF, this species has been collected at elevations ranging from 16 to 10840 ft, with an average (median) of 5092 ft.

Species Range

Specimens of the Caddisfly Species Onocosmoecus unicolor

2 Adults
1 Male Adult
1 Larva

Start a Discussion of Onocosmoecus unicolor


  • LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.

Caddisfly Species Onocosmoecus unicolor (Great Late-Summer Sedges)

Species Range
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