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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I caught this tiny larva without a case, but it seems to key pretty clearly to to Glossosomatidae. From there, the lack of sclerites on the mesonotum points to either Glossosoma or Anagapetus. Although it's difficult to see in a 2D image from the microscope, it's pretty clear in the live 3D view that the pronotum is only excised about 1/3 of its length to accommodate the forecoxa, not 2/3, which points to Glossosoma at Couplet 5 of the Key to Genera of Glossosomatidae Larvae.
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Wbranch on Jan 8, 2013January 8th, 2013, 1:25 pm EST
Once upon a time I decided to go look at the Letort and figured I'd need a picture to remember my failure. I went in early July, early in the morning for Tricos, and saw one rise in three hours. Guess I was in the wrong place, or maybe the wrong day, or year, or as the guy said "ya shoulda been here yesterday."
Catskill fly fisher for fifty-five years.