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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.

Artistic view of a Perlodidae (Springflies and Yellow Stones) Stonefly Nymph from the Yakima River in Washington
This one seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.
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 Claassenia sabulosa (Golden Stone) Stonefly Adult Pictures

I think this is one of the most poorly understood of the golden stoneflies. It is rare to see any articles about it or fishing the hatch. It emerges late in summer usually on medium to large rivers.The adults are quite secretive but it is something to see the adults run across the water surface. These guys can really run. The males have short wings.The females are up to 1 1/4 inch long rivaling the salmonfly as the largest adult stonefly in the west.The adults are not real golden in color, especially the females which are more of an off yellow to off white abdomen. In handling the adults it is obvious that they shun direct sunlight. I find them by turning over rocks close to the water's edge.

Female Claassenia sabulosa (Perlidae) (Golden Stone) Stonefly Adult from the Touchet River in Washington
Female Claassenia sabulosa (Perlidae) (Golden Stone) Stonefly Adult from the Touchet River in Washington
Female Claassenia sabulosa (Perlidae) (Golden Stone) Stonefly Adult from the Touchet River in Washington

This stonefly was collected from the Touchet River in Washington on August 3rd, 2011 and added to Troutnut.com by Bnewell on August 3rd, 2011.

Discussions of this Adult

Question
10 replies
Posted by Flymonster on Sep 7, 2011
Last reply on Sep 10, 2012 by PaulRoberts
Is this the species known commonly as Short-winged Stonefly?

Dave

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Female Claassenia sabulosa (Golden Stone) Stonefly Adult Pictures

Collection details
Location: Touchet River, Washington
Date: August 3rd, 2011
Added to site: August 3rd, 2011
Author: Bnewell
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