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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.

Dorsal view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington
This species was fairly abundant in a February sample of the upper Yakima.
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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Millcreek has attached these 3 pictures to aid in identification. The message is below.
Entoman
Entoman's profile picture
Northern CA & ID

Posts: 2604
Entoman on Sep 5, 2015September 5th, 2015, 10:48 pm EDT
Good to hear from you, Luke! Hope all is going well!

I'm gonna float A. bifurcatum

Blub, blub, blub... I guess it drowned. :)

Mark,
My hope was to "spur" competing possibilities/guesses for further discussion, not to offer my opinion of what I think it actually is. In that I failed as no other options were offered. My gut tells me it is a spur-wing, but I could be wrong. Most of those species were put into the new genus, so I feel better with that at least. But, that's based on probability from known habitation and observable similarities rather than non-similarities based soley on maculation.

Absent an associated male adult (a dime against a doughnut it has spurs on the hind wings) there's liitle to be sure against the possibility of Procloeon, though the overall conformation of the nymph doesn't look right for that genus to me.

"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman

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