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

I captured this dun on the same night as a spinner which is probably of the same species.

Lateral view of a Female Baetidae (Blue-Winged Olive) Mayfly Dun from the West Branch of Owego Creek in New York

Female Baetidae (Blue-Winged Olive) Mayfly Dun from the West Branch of Owego Creek in New York

Dorsal view of a Female Baetidae (Blue-Winged Olive) Mayfly Dun from the West Branch of Owego Creek in New York

Ventral view of a Female Baetidae (Blue-Winged Olive) Mayfly Dun from the West Branch of Owego Creek in New York

Ruler view of a Female Baetidae (Blue-Winged Olive) Mayfly Dun from the West Branch of Owego Creek in New York The smallest ruler marks are 1 mm.

This mayfly was collected from the West Branch of Owego Creek in New York on August 9th, 2006 and added to Troutnut.com by Troutnut on August 11th, 2006.

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