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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.

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.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Female Hesperoperla pacifica (Golden Stone) Stonefly Adult Pictures

Lateral view of a Female Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Adult from the Henry's Fork of the Snake River in Idaho
Artistic view of a Female Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Adult from the Henry's Fork of the Snake River in Idaho
Ventral view of a Female Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Adult from the Henry's Fork of the Snake River in Idaho
Female Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Adult from the Henry's Fork of the Snake River in Idaho
The dark, hairless, sclerotized rectangle on the subgenital plate (in focus in this picture) is a key identifying characteristic for Hesperoperla pacifica.

Female Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Adult from the Henry's Fork of the Snake River in Idaho
Female Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Adult from the Henry's Fork of the Snake River in Idaho
Female Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Adult from the Henry's Fork of the Snake River in Idaho
Female Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Adult from the Henry's Fork of the Snake River in Idaho
Female Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Adult from the Henry's Fork of the Snake River in Idaho
Dorsal view of a Female Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Adult from the Henry's Fork of the Snake River in Idaho
Female Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Adult from the Henry's Fork of the Snake River in Idaho
Ruler view of a Female Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Adult from the Henry's Fork of the Snake River in Idaho The smallest ruler marks are 1 mm.

This stonefly was collected from the Henry's Fork of the Snake River in Idaho on August 1st, 2020 and added to Troutnut.com by Troutnut on August 17th, 2020.


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Female Hesperoperla pacifica (Golden Stone) Stonefly Adult Pictures

Collection details
Location: Henry's Fork of the Snake River, Idaho
Date: August 1st, 2020
Added to site: August 17th, 2020
Author: Troutnut
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