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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Ecdyonurus nymphs

Ecdyonurus criddlei (Little Slate-Winged Dun) Mayfly Nymph

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Ecdyonurus criddlei (Heptageniidae) (Little Slate-Winged Dun) Mayfly Nymph from Kintla Lake in Montana

This is an interesting Heptageniid mayfly since in western Montana it is only found in cold lakes, especially those in Glacier National Park.

Collected July 30, 2007 from Kintla Lake in Montana

Added by Bnewell on June 26, 2011

Collected July 30, 2007 from Kintla Lake in Montana and added by Bnewell on June 26, 2011

Jmw975
Guelph, Ontario

Posts: 20

Jmw975 on Dec 11, 2012December 11th, 2012, 3:47 am EST

Hi all,
These specimens are in great shape!

the lower nymph in this photo is definitely not E. criddlei, but E. simplicoides. E. simplicioides has that distinctive color pattern with the pair of rectangular pale markings on tergum 4 and no median markings on the other terga.

The upper specimen is probably E. criddlei, but seems to have more extensive pale markings than specimens from further west.

cheers,
Jeff