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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.

Dorsal view of a Glossosoma (Glossosomatidae) (Little Brown Short-horned Sedge) Caddisfly Larva from the Yakima River in Washington
I caught this tiny larva without a case, but it seems to key pretty clearly to to Glossosomatidae. From there, the lack of sclerites on the mesonotum points to either Glossosoma or Anagapetus. Although it's difficult to see in a 2D image from the microscope, it's pretty clear in the live 3D view that the pronotum is only excised about 1/3 of its length to accommodate the forecoxa, not 2/3, which points to Glossosoma at Couplet 5 of the Key to Genera of Glossosomatidae Larvae.
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 Sweltsa (Sallfly) Stonefly Adult Pictures

These stoneflies--abundant during midday--seemed at first to be flying around with plain yellow bodies, but on closer inspection turn out to have striking, fiery red abdomens.

Lateral view of a Female Sweltsa (Chloroperlidae) (Sallfly) Stonefly Adult from the Madison River in Montana
Ruler view of a Female Sweltsa (Chloroperlidae) (Sallfly) Stonefly Adult from the Madison River in Montana The smallest ruler marks are 1 mm.
Female Sweltsa (Chloroperlidae) (Sallfly) Stonefly Adult from the Madison River in Montana
Female Sweltsa (Chloroperlidae) (Sallfly) Stonefly Adult from the Madison River in Montana
Female Sweltsa (Chloroperlidae) (Sallfly) Stonefly Adult from the Madison River in Montana
Female Sweltsa (Chloroperlidae) (Sallfly) Stonefly Adult from the Madison River in Montana
Ventral view of a Female Sweltsa (Chloroperlidae) (Sallfly) Stonefly Adult from the Madison River in Montana
Artistic view of a Female Sweltsa (Chloroperlidae) (Sallfly) Stonefly Adult from the Madison River in Montana

This stonefly was collected from the Madison River in Montana on June 30th, 2019 and added to Troutnut.com by Troutnut on July 17th, 2019.

Discussions of this Adult

Sweltsa?
1 replies
Posted by Taxon on Jul 17, 2019
Last reply on Jul 17, 2019 by Troutnut
Hi Jason-

My guess would be genus Sweltsa, of which I believe there to be ~8 species in MT. It looks pretty similar to a (mostly) dorsal view of Sweltsa townsesi, which is pictured in American Stoneflies: A Photographic Guide to the Plecoptera by Bill B. Stark, et. al. However, I believe that species is only present in the Northern Sierra Nevada Mountains of CA and NV.
Anyone able to ID this Chloroperlid?
Posted by Troutnut on Jul 17, 2019
Last reply on Jul 17, 2019 by Troutnut
I didn't do the best job taking pictures of key characteristics (such as wing venation), but I'm hoping somebody might be familiar with the striking color pattern. I'd love to know the species on this one.

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Female Sweltsa (Sallfly) Stonefly Adult Pictures

Collection details
Location: Madison River, Montana
Date: June 30th, 2019
Added to site: July 17th, 2019
Author: Troutnut
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