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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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Male Ephemera simulans (Brown Drake) Mayfly Dun Pictures

This mayfly was collected from Flathead Lake in Montana on July 11th, 2009 and added to Troutnut.com by Bnewell on June 27th, 2011.

Discussions of this Dun

Lifestage
1 replies
Posted by Taxon on Jun 24, 2019
Last reply on Jul 2, 2019 by Troutnut
Hi Bob-

I believe this mayfly to be a female dun (subimago) rather than a spinner (imago) as it was labeled. Do you have a reason to believe I am mistaken?

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Male Ephemera simulans (Brown Drake) Mayfly Dun Pictures

Collection details
Location: Flathead Lake, Montana
Date: July 11th, 2009
Added to site: June 27th, 2011
Author: Bnewell
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