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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 Species of Agnetina Nymphs, Couplet 1

Identification: Key to Species of Agnetina Nymphs, Couplet 1

Adapted from Stark et al (1986)
Option 1Option 2
Apex of tergum 10 dark
Nymphal tergum 10 of Agnetina annulipes.
Nymphal tergum 10 of Agnetina annulipes. Figure source: Stark et al (1986)
Apex of tergum 10 light
Nymphal tergum 10 of Agnetina flavescens.
Nymphal tergum 10 of Agnetina flavescens. Figure source: Stark et al (1986)
Remaining species: Agnetina capitata and Agnetina flavescens
3 Example Specimens
Agnetina annulipes Go to Couplet 2
Adapted from Stark et al (1986)
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 Agnetina annulipes:
  • Apex of tergum 10 dark
Leads to Couplet 2:
  • Apex of tergum 10 light
Couplet 2
Leads to Agnetina capitata:
  • Arms of light-colored M-shaped line on head directed essentially laterally
  • Dark pigment of tergum 10 continuous
Leads to Agnetina flavescens:
  • Arms of light-colored M-shaped line on head directed posterolaterally
  • Dark pigment of tergum 10 interrupted mesally

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References

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