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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.

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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Identification: Key to Genera of Rhyacophilidae Adults, Couplet 1

Identification: Key to Genera of Rhyacophilidae Adults, Couplet 1

Adapted from Merritt R.W., Cummins, K.W., and Berg, M.B. (2019)
This couplet refers figures (usually designated 'sf') from this source.
You will need the source (make sure to get the same edition!) to see them.
Option 1Option 2
Mesoscutellum without long hairs
Figure from this Rhyacophila adult.
Mesoscutellum with tuft of long, fine hairs
Forewings each less than 20 mm longForewings each more than 20 mm long
WidespreadPacific states
Adults as in sf 10.191
1 Example Specimen
Rhyacophila Himalopsyche
The current couplet is highlighted with darker colors and a icon, and couplets leading to this point have a icon.
Couplet 1

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Couplet 1 (You are here)
Leads to Rhyacophila:
  • Mesoscutellum without long hairs
  • Forewings each less than 20 mm long
  • Widespread
  • Adults as in sf 10.191
Leads to Himalopsyche
(Himalopsyche phryganea):
  • Mesoscutellum with tuft of long, fine hairs
  • Forewings each more than 20 mm long
  • Pacific states

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References

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