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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Could be Himalopsyche?

Rhyacophila brunnea (Green Sedge) Caddisfly Larva

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Dorsal view of a Rhyacophila brunnea (Rhyacophilidae) (Green Sedge) Caddisfly Larva from unknown in Wisconsin

Collected February 6, 2004 from unknown in Wisconsin

Added by Troutnut on January 25, 2006

Collected February 6, 2004 from unknown in Wisconsin and added by Troutnut on January 25, 2006

Litobrancha
Knoxville TN

Posts: 51

Litobrancha on Sep 5, 2006September 5th, 2006, 8:38 am EDT

Wow! Looks like Himalopsyche, a Rhyacophilid we don't get down here. World checklist has one Nearctic species, H. phryganea. Quick note, Himalopsyche fifth instars are huge and supposed to have thoracic branched gills too. Not sure what other Rhyacophila larvae have abdominal gills, in the SE USA only R. brunnea does and i've never seen it. Great photo!

Troutnut