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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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Female Cinygmula tarda Mayfly Spinner Pictures

For details about the tentative identification of this female spinner, see the page for associated male spinner, captured from the same mating swarm.

Ruler view of a Female Cinygmula tarda (Heptageniidae) Mayfly Spinner from the Cedar River in Washington The smallest ruler marks are 1 mm.
Lateral view of a Female Cinygmula tarda (Heptageniidae) Mayfly Spinner from the Cedar River in Washington
Ventral view of a Female Cinygmula tarda (Heptageniidae) Mayfly Spinner from the Cedar River in Washington
Is that wing lightly tinged with yellow, or do the yellow veins just create an illusion to that effect? I don't know.

Dorsal view of a Female Cinygmula tarda (Heptageniidae) Mayfly Spinner from the Cedar River in Washington

This mayfly was collected from the Cedar River in Washington on June 30th, 2021 and added to Troutnut.com by Troutnut on July 2nd, 2021.


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Female Cinygmula tarda Mayfly Spinner Pictures

Collection details
Location: Cedar River, Washington
Date: June 30th, 2021
Added to site: July 2nd, 2021
Author: Troutnut
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