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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

Lateral view of a Female Sweltsa borealis (Chloroperlidae) (Boreal Sallfly) Stonefly Adult from Harris Creek in Washington
I was not fishing, but happened to be at an unrelated social event on a hill above this tiny creek (which I never even saw) when this stonefly flew by me. I assume it came from there. Some key characteristics are tricky to follow, but process of elimination ultimately led me to Sweltsa borealis. It is reassuringly similar to this specimen posted by Bob Newell years ago. It is also so strikingly similar to this nymph from the same river system that I'm comfortable identifying that nymph from this adult. I was especially pleased with the closeup photo of four mites parasitizing this one.
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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Lateral view of a Hydropsyche aenigma (Hydropsychidae) (Spotted Sedge) Caddisfly Adult from the West Branch of the Delaware River in New York
These big caddisflies were tempting trout as they wriggled out of their shucks, while others skated across the water at a medium pace, probably egg-laying.
Troutnut's profile picture
Bellevue, WA

Posts: 2758
Troutnut on May 18, 2007May 18th, 2007, 1:43 pm EDT
I'm really just guessing. I'm too busy too key it out right now but I'd really like to know what it is. This was one of the main species the fish were taking (along with Apple Caddis) on the West Branch of the Delaware the other day.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
Taxon on May 18, 2007May 18th, 2007, 4:22 pm EDT
Sure looks like Hydropsyche to me. There are ~13 species in NY, and I don't have access to species keys. However, I suppose H. betteni can be eliminated as a possibility, as your specimen would be too short for that species.
Best regards,
Roger Rohrbeck
Site Editor
"Bear Swamp," PA

Posts: 1681
GONZO on May 20, 2007May 20th, 2007, 8:49 am EDT
If I'm reading the wing venation correctly in photo #16, this looks like Ceratopsyche.
Grants Pass, OR

Posts: 302
Creno on Dec 22, 2007December 22nd, 2007, 10:10 am EST
Folks - Ceratopsyche - Symphitopsyche - Hydropsyche - just another problem for the splitters. Right now there seem to be two schools and both are represented in the previous postings.

While the photos are some of the best I have seen of the details necessary to make a determination, I cannot quite make out the single final character needed to be sure (the lateral spur on that most intimate of the male parts). But based on what I can see, and the great photo of the goldish spots on the wings I would suggest Hydropsyche (Ceratopsyche) aenigma.

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