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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 Onocosmoecus (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Larva from the Yakima River in Washington
This specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.
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 Drunella (Blue-Winged Olive) Mayfly Dun Pictures

Ventral view of a Male Drunella (Ephemerellidae) (Blue-Winged Olive) Mayfly Dun from the Ruby River in Montana
Ruler view of a Male Drunella (Ephemerellidae) (Blue-Winged Olive) Mayfly Dun from the Ruby River in Montana The smallest ruler marks are 1 mm.
Dorsal view of a Male Drunella (Ephemerellidae) (Blue-Winged Olive) Mayfly Dun from the Ruby River in Montana

This mayfly was collected from the Ruby River in Montana on July 7th, 2019 and added to Troutnut.com by Troutnut on July 18th, 2019.


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Male Drunella (Blue-Winged Olive) Mayfly Dun Pictures

Collection details
Location: Ruby River, Montana
Date: July 7th, 2019
Added to site: July 18th, 2019
Author: Troutnut
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