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.

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Mayfly Species Cinygmula uniformis

Specimens of the Mayfly Species Cinygmula uniformis

1 Male Spinner

Male Cinygmula uniformis Mayfly Spinner

13 Pictures

The identification of this specimen is not positive because some of the key characteristics conflict. The uniform amber tint of the wings and the rusty-colored mid-ventral markings on some of the abdominal sternites point to Cinygmula uniformis, but I could not locate the small ventral subapical spines on the penes that are supposed to also diagnose that species (the ones visible in the pictures aren't the ones I'm talking about). If I prioritize that characteristics, this would probably be Cinygmula mimus, but then the wing and sternite shading/markings are wrong.

Collected May 22, 2022 from the South Fork Snoqualmie River in Washington

Added by Troutnut on May 24, 2022