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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.

Dorsal view of a Holocentropus (Polycentropodidae) Caddisfly Larva from the Yakima River in Washington
This one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their larvae.
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.
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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

References

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

Caddisfly Species Onocosmoecus unicolor (Great Late-Summer Sedges)

Taxonomy
Species Range
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