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.

Neversink Gorge (Wolf Brook) in New York

Stream photos

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Perlodidae (Springflies and Yellow Stones) Stonefly Nymph Perlodidae (Springflies and Yellow Stones) Stonefly Nymph

Artistic view of a Perlodidae (Springflies and Yellow Stones) Stonefly Nymph from the Yakima River in Washington

This one seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.

11 Recently Added Photos

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 Leucrocuta hebe (Little Yellow Quill) Mayfly Dun Pictures

I found this dun on the same piece of stream as a similar spinner, probably of the same species.

Female Leucrocuta hebe (Heptageniidae) (Little Yellow Quill) Mayfly Dun from Mystery Creek #43 in New York

Lateral view of a Female Leucrocuta hebe (Heptageniidae) (Little Yellow Quill) Mayfly Dun from Mystery Creek #43 in New York

Dorsal view of a Female Leucrocuta hebe (Heptageniidae) (Little Yellow Quill) Mayfly Dun from Mystery Creek #43 in New York

Ventral view of a Female Leucrocuta hebe (Heptageniidae) (Little Yellow Quill) Mayfly Dun from Mystery Creek #43 in New York

Ruler view of a Female Leucrocuta hebe (Heptageniidae) (Little Yellow Quill) Mayfly Dun from Mystery Creek #43 in New York The smallest ruler marks are 1 mm.

This mayfly was collected from Mystery Creek #43 in New York on September 19th, 2006 and added to Troutnut.com by Troutnut on October 4th, 2006.

Discussions of this Dun

Looks like Leucrocuta

Posted by GONZO on Oct 6, 2006

Last reply on Oct 6, 2006 by GONZO

Haven't checked any keys to verify, but most of the little late-season Cahill-looking duns are Leucrocuta. If I had to guess at the species, I'd say hebe (Little Yellow Quill). It is probably the most common L. spp. in the East and has a long hatching period that extends well into the fall.

I would also agree that the spinner you photographed is the same species.

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