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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 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.
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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Troutnut.com User Jb1023

Troutnut.com User Jb1023

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Co Springs
Biography & Thoughts
I have not fly fished in more than 20 yrs and even then I was not successful. I have some new family members that are avid fly fisherman and I am looking to go out with them, I Just want to be a part of the pack Just kidding, any excuse to spend time outside, and I don't mean doing yard work. Probably looking at river/lake trout to start. Hoping I enjoy it once I get setup and start doing it, just can't see how I wouldn't. Anyway, already learned a bunch from some very helpful people on this site and who knows, perhaps one day I can pass some knowledge on to others.
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