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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.

Dorsal view of a Setvena wahkeena (Perlodidae) (Wahkeena Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
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 Tricorythodes (Trico) Mayfly Spinner Pictures

This female Trico was collected with an associated male and many others.

Lateral view of a Female Tricorythodes (Leptohyphidae) (Trico) Mayfly Spinner from the Bitterroot River in Montana
Female Tricorythodes (Leptohyphidae) (Trico) Mayfly Spinner from the Bitterroot River in Montana
Ventral view of a Female Tricorythodes (Leptohyphidae) (Trico) Mayfly Spinner from the Bitterroot River in Montana
Dorsal view of a Female Tricorythodes (Leptohyphidae) (Trico) Mayfly Spinner from the Bitterroot River in Montana
Ruler view of a Female Tricorythodes (Leptohyphidae) (Trico) Mayfly Spinner from the Bitterroot River in Montana The smallest ruler marks are 1 mm.

This mayfly was collected from the Bitterroot River in Montana on September 6th, 2021 and added to Troutnut.com by Troutnut on September 8th, 2021.


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Female Tricorythodes (Trico) Mayfly Spinner Pictures

Collection details
Location: Bitterroot River, Montana
Date: September 6th, 2021
Added to site: September 8th, 2021
Author: Troutnut
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