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.

Firehole River Sunset

From the Firehole River in Wyoming

Stream photos

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In the Mayfly Genus Tricorythodes by Bwoklink (Martinlf replied)

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Tricorythodes (Trico) Mayfly Nymph Tricorythodes (Trico) Mayfly Nymph

Dorsal view of a Tricorythodes (Leptohyphidae) (Trico) Mayfly Nymph from Mystery Creek #308 in Washington

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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 Paraleptophlebia sculleni Mayfly Spinner Pictures

For a species not yet reported in my state, I've been surprised to find these in two different locations lately. I was tempted to think they're the more common Paraleptophlebia debilis, but the characteristic big dorsal bump on the claspers just isn't present.

Ruler view of a Male Paraleptophlebia sculleni (Leptophlebiidae) Mayfly Spinner from the Middle Fork Snoqualmie River in Washington The smallest ruler marks are 1 mm.

Lateral view of a Male Paraleptophlebia sculleni (Leptophlebiidae) Mayfly Spinner from the Middle Fork Snoqualmie River in Washington

Male Paraleptophlebia sculleni (Leptophlebiidae) Mayfly Spinner from the Middle Fork Snoqualmie River in Washington

Dorsal view of a Male Paraleptophlebia sculleni (Leptophlebiidae) Mayfly Spinner from the Middle Fork Snoqualmie River in Washington

Ventral view of a Male Paraleptophlebia sculleni (Leptophlebiidae) Mayfly Spinner from the Middle Fork Snoqualmie River in Washington

This mayfly was collected from the Middle Fork Snoqualmie River in Washington on August 4th, 2019 and added to Troutnut.com by Troutnut on August 5th, 2019.

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