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.

Stream photos

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Onocosmoecus (Great Late-Summer Sedge) Caddisfly Larva Onocosmoecus (Great Late-Summer Sedge) Caddisfly Larva

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.

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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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Female Baetidae (Blue-Winged Olive) Mayfly Dun Pictures

Lateral view of a Female Baetidae (Blue-Winged Olive) Mayfly Dun from the North Fork Stillaguamish River in Washington

Female Baetidae (Blue-Winged Olive) Mayfly Dun from the North Fork Stillaguamish River in Washington

Each ruler mark is 1/16 inch

Female Baetidae (Blue-Winged Olive) Mayfly Dun from the North Fork Stillaguamish River in Washington

This mayfly was collected from the North Fork Stillaguamish River in Washington on July 11th, 2017 and added to Troutnut.com by Troutnut on July 12th, 2017.

Discussions of this Dun

Id?

Posted by Taxon on Jul 12, 2017

Last reply on Jul 12, 2017 by Taxon

Hi Jason-

Diphetor hageni female subimago would be my guess. What do you think?

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