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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 Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington
This Skwala nymph still has a couple months left to go before hatching, but it's still a good representative of its species, which was extremely abundant in my sample for a stonefly of this size. It's obvious why the Yakima is known for its Skwala hatch.
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 Limnephilus thorus (Summer Flier Sedges)

Where & when

Time of year : September and October

Swisher and Richards were the first to discover important hatches of this species on a trout stream. They found it in a major Montana river and reported it in Selective Trout.

In 4 records from GBIF, adults of this species have been collected during September (75%) and August (25%).

Species Range

Start a Discussion of Limnephilus thorus

References

Caddisfly Species Limnephilus thorus (Summer Flier Sedges)

Taxonomy
Species Range
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