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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

Dorsal view of a Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.
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

Identification: Key to Genera of Rhyacophilidae Adults

Adapted from Merritt R.W., Cummins, K.W., and Berg, M.B. (2019)
This couplet refers figures (usually designated 'sf') from this source.
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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
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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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