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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.

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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Bfdfisher
Posts: 1
Bfdfisher on May 26, 2011May 26th, 2011, 5:50 pm EDT
This was the hatch of the night on 25 May 2011. It was epic....yet nothing was rising or visibly feeding. Not really positive what it is. It could be a Hendrickson, it's just so dark and eyes are so red. All the bugs coming off had the same strikingly red eyes.
Thanks all
PaulRoberts
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Colorado

Posts: 1776
PaulRoberts on May 26, 2011May 26th, 2011, 7:10 pm EDT
Male Ephemerellids of some type. Late for subvaria unless you are up north. Early for Seratella me thinks.

Where are you?
What size (hook size) were they?
Troutnut
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Administrator
Bellevue, WA

Posts: 2758
Troutnut on May 27, 2011May 27th, 2011, 12:36 am EDT
If you click the "edit" link above your post, you'll see an option to attach your picture... that'll potentially help us with the ID.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
PaulRoberts
PaulRoberts's profile picture
Colorado

Posts: 1776
PaulRoberts on May 27, 2011May 27th, 2011, 6:06 am EDT
I'm going to guess right now:

Serratella deficiens/tibialis -#16 chocolate dun with nearly black wings, pale legs, and red eyes on males.

If not such dark wings and a dark olive body then mebbe a Drunella.

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