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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.

Lateral view of a Psychodidae True Fly Larva from Mystery Creek #308 in Washington
This wild-looking little thing completely puzzled me. At first I was thinking beetle or month larva, until I got a look at the pictures on the computer screen. I made a couple of incorrect guesses before entomologist Greg Courtney pointed me in the right direction with Psychodidae. He suggested a possible genus of Thornburghiella, but could not rule out some other members of the tribe Pericomini.
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.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

This topic is about the Mayfly Genus Epeorus

There is remarkable variety of form and color within this prolific genus of fast-water mayflies. Different species are found across the country, and several cause good hatches. Fly anglers are likely to encounter the lesser species on occasion, too.

The best Epeorus hatch in the East is Epeorus pleuralis, the famous Quill Gordon, the first abundant large mayfly hatch of the year. Epeorus vitreus comes a little later and is important in both the East and Midwest.

In the West, Epeorus longimanus dominates in fast, high-altitude streams, while Epeorus albertae inhabits slower and lower waters.

Example specimens

GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681
GONZO on Oct 4, 2006October 4th, 2006, 7:27 am EDT
I believe rubidus = vitreus
Troutnut
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Administrator
Bellevue, WA

Posts: 2758
Troutnut on Oct 4, 2006October 4th, 2006, 7:51 am EDT
Thanks. Good catch. That must be a recent change, or at least recently added to the mayfly species list at Purdue.

I have one small thing on my programming to-do list before I can make the change, but I'll do it soon.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Taxon
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Site Editor
Plano, TX

Posts: 1311
Taxon on Oct 4, 2006October 4th, 2006, 8:08 am EDT
... That must be a recent change, or at least recently added to the mayfly species list at Purdue. ...


Jason-

Right you are. These are the most recent updates.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Troutnut
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Administrator
Bellevue, WA

Posts: 2758
Troutnut on Oct 4, 2006October 4th, 2006, 8:12 am EDT
Thanks for compiling that list! It will be a big time-saver when I'm ready to update my taxa.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

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