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The Specimen

Sweltsa (Sallflies) Stonefly AdultSweltsa (Sallflies) Stonefly Adult View 8 PicturesThese 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.

Collected June 30, 2019 from the Madison River in Montana
Added to Troutnut.com by on July 17, 2019

The Discussion

TaxonJuly 18th, 2019
Site Editor
Plano, TX

Posts: 1291
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.
Roger Rohrbeck
www.FlyfishingEntomology.com
TroutnutJuly 18th, 2019, 12:03 am
Administrator
Bellevue, WA

Posts: 2533
Thanks Roger. I'll put it there for now, along with another specimen of similar but not identical coloration and a few mm greater length.

FYI, today and tomorrow I'm adding quite a few more specimens from this year's Montana trip and would definitely appreciate any ID thoughts if you have time. I'll message Dave about the caddis soon, too.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

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