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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.

Ventral view of a Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Larva from the Yakima River in Washington
With a bit of help from the microscope, this specimen keys clearly and unsurprisingly to Hydropsyche.
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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Male Ephemera simulans (Brown Drake) Mayfly Dun Pictures

This mayfly was collected from Flathead Lake in Montana on July 11th, 2009 and added to Troutnut.com by Bnewell on June 27th, 2011.

Discussions of this Dun

Lifestage
1 replies
Posted by Taxon on Jun 24, 2019
Last reply on Jul 2, 2019 by Troutnut
Hi Bob-

I believe this mayfly to be a female dun (subimago) rather than a spinner (imago) as it was labeled. Do you have a reason to believe I am mistaken?

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Male Ephemera simulans (Brown Drake) Mayfly Dun Pictures

Collection details
Location: Flathead Lake, Montana
Date: July 11th, 2009
Added to site: June 27th, 2011
Author: Bnewell
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