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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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Motrout's profile picture
Posts: 319
Motrout on Jul 11, 2014July 11th, 2014, 7:58 am EDT
I'm gonna be in that part of the world in a couple of weeks (last couple days of July, first couple of August._ I'll be based out of Ridgway State park along the Uncompahgre tailwater (below Ridgway Dam). I'm also looking into heading over to the Black Canyon to fish the East Portal. This is going to be a little bit of a hit and run trip, so a full hike-in to the Black Canyon looks unlikely at this point.

I've only got three solid days to fish, so it's unfortunately going to have to be a "just hit the highlights" kind of deal. Anyone ever been to that area before?

I've fished a ton in NW Colorado, but that part of the state may as well be the dark side of the moon, and I'm excited as heck to see it. I've been told to expect a pretty good Pale Morning Dun hatch on the Unc, so I've got a bunch of those ready to go.
"I don't know what fly fishing teaches us, but I think it's something we need to know."-John Gierach

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