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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.

A beautiful braided reach of the Sag River, with the Philip Smith Mountains in the Arctic National Wildlife Refuge (ANWR) in the background. From the Sagavanirktok River in Alaska

Stream photos

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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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  3. Found in Colorado

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  3. Found in Colorado

Pdcox has attached these 2 pictures to aid in identification. The message is below.
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Pdcox
Kansas city

Posts: 12
Pdcox on Jul 23, 2020July 23rd, 2020, 9:17 am EDT
Underside and topside of a nymph found at 8200' elevation, middle Colorado, small rolling creek. Note the red underbelly
Taxon
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
Taxon on Jul 23, 2020July 23rd, 2020, 12:18 pm EDT
Hi Paul-

I believe this mayfly nymph to be of genus Rhithrogena.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

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