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.

Stream photos

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Neoleptophlebia Mayfly Nymph Neoleptophlebia Mayfly Nymph

Dorsal view of a Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from the Yakima River in Washington

Some characteristics from the microscope images for the tentative species id: The postero-lateral projections are found only on segment 9, not segment 8. Based on the key in Jacobus et al. (2014), it appears to key to Neoleptophlebia adoptiva or Neoleptophlebia heteronea, same as this specimen with pretty different abdominal markings. However, distinguishing between those calls for comparing the lengths of the second and third segment of the labial palp, and this one (like the other one) only seems to have two segments. So I'm stuck on them both. It's likely that the fact that they're immature nymphs stymies identification in some important way.

10 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 Alloperla (Sallfly) Stonefly Adult Pictures

These little green stoneflies were the most common bug on a June day fishing the North Fork Couer d'Alene, although the trout never rose more than sporadically to them or anything else.

Lateral view of a Female Alloperla (Chloroperlidae) (Sallfly) Stonefly Adult from the North Fork Couer d'Alene River in Idaho

Female Alloperla (Chloroperlidae) (Sallfly) Stonefly Adult from the North Fork Couer d'Alene River in Idaho

Ruler view of a Female Alloperla (Chloroperlidae) (Sallfly) Stonefly Adult from the North Fork Couer d'Alene River in Idaho The smallest ruler marks are 1 mm.

Ventral view of a Female Alloperla (Chloroperlidae) (Sallfly) Stonefly Adult from the North Fork Couer d'Alene River in Idaho

This stonefly was collected from the North Fork Couer d'Alene River in Idaho on June 25th, 2019 and added to Troutnut.com by Troutnut on July 17th, 2019.

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References

Jacobus, L. M., Wiersema, N.A., and Webb, J.M. 2014. Identification of Far Northern and Western North American Mayfly Larvae (Insecta: Ephemeroptera), North of Mexico; Version 2. Joint Aquatic Science meeting, Portland, OR. Unpublished workshop manual. 1-176.