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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

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 Doroneuria baumanni (Golden Stone) Stonefly Adult Pictures

I found this stonefly on some streamside vegetation. I didn't see any in the air in several hours of fishing.

Lateral view of a Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Ventral view of a Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Ruler view of a Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington The smallest ruler marks are 1 mm.
Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Dorsal view of a Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Metabasisternum with a good view of the furcal pits and sutures that confirm the family ID.

Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Dorsal view of the terminalia.

Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Dorsal closeup view of the terminalia.

Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington

This stonefly was collected from the Foss River in Washington on September 10th, 2020 and added to Troutnut.com by Troutnut on September 19th, 2020.


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Male Doroneuria baumanni (Golden Stone) Stonefly Adult Pictures

Collection details
Location: Foss River, Washington
Date: September 10th, 2020
Added to site: September 19th, 2020
Author: Troutnut
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