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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.

Artistic view of a Perlodidae (Springflies and Yellow Stones) Stonefly Nymph from the Yakima River in Washington
This one seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.
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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Belostoma flumineum (Electric Light Bug) Giant Water Bug Adult Pictures

I haven't seen the imitation of these things stressed, but in August 2003 on one of my favorite rivers the largest brown trout I kept had stomachs full of these things.

This giant water bug was collected from the Namekagon River in Wisconsin on January 13th, 2004 and added to Troutnut.com by Troutnut on January 25th, 2006.

Discussions of this Adult

Imitating Belostoma
Posted by Appangler on Apr 26, 2007
Last reply on Apr 26, 2007 by Appangler
Just a thought...perhaps a "cow dung" traditional wet fly would cover this bug. As for the green sheen on the wing, one might use slips from green wing teal secondary wing feathers.

AA

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Belostoma flumineum (Electric Light Bug) Giant Water Bug Adult Pictures

Collection details
Location: Namekagon River, Wisconsin
Date: January 13th, 2004
Added to site: January 25th, 2006
Author: Troutnut
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