Salmonflies
Pteronarcys californica
The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
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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.
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Stonefly Genus Paragnetina (Golden Stones)
Paragnetina media is an important species in both the East and the Midwest, and Paragnetina immarginata is important in the East.
Genus Range
Identification
To determine whether a specimen of Perlidae belongs to Paragnetina, use the Key to Genera of Perlidae Nymphs.
Specimens of the Stonefly Genus Paragnetina
1 Male Adult
2 Female Adults
I keyed this specimen to Paragnetina, and range maps would seem to rule out every species of that genus except for the common Paragnetina media.
3 Nymphs
Start a Discussion of Paragnetina
Stonefly Genus Paragnetina (Golden Stones)
Taxonomy
Species in Paragnetina
Paragnetina immarginataBeautiful Stoneflies
1
9
Paragnetina mediaEmbossed Stoneflies
4
27
Species in Paragnetina: Paragnetina immarginata, Paragnetina media
3 species (Paragnetina fumosa, Paragnetina ichusa, and Paragnetina kansensis) aren't included.