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.
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I was not fishing, but happened to be at an unrelated social event on a hill above this tiny creek (which I never even saw) when this stonefly flew by me. I assume it came from there. Some key characteristics are tricky to follow, but process of elimination ultimately led me to Sweltsa borealis. It is reassuringly similar to this specimen posted by Bob Newell years ago. It is also so strikingly similar to this nymph from the same river system that I'm comfortable identifying that nymph from this adult. I was especially pleased with the closeup photo of four mites parasitizing this one.
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Stonefly Genus Alloperla (Sallflies)
This is a common genus.
Genus Range
Specimens of the Stonefly Genus Alloperla
1 Female Adult
These little green stoneflies were the most common bug on a June day fishing the North Fork Couer d'Alene, although the trout never rose more than sporadically to them or anything else.
3 Adults
This specimen was completely green when I collected it from among many others gathered on a midstream rock along with their nymphal shucks early in the morning. There was also a yellow one with them, which I assumed was a different species. Now that I've seen how this one started changing from green to yellow, I have to wonder if they weren't the same species and the yellow one was just older.
At Touchet Corral.
2 Nymphs
Start a Discussion of Alloperla
References
- Schwiebert, Ernest G. 1955. Matching the Hatch. MacMillan Publishing Company.
Stonefly Genus Alloperla (Sallflies)
Taxonomy
Species in Alloperla
Alloperla biserrataDusky Sallflies
0
0
Alloperla caudataLittle Yellow Stoneflies
0
0
Alloperla delicataLittle Green Stoneflies
0
0
Alloperla imbecillaLittle Green Stoneflies
0
0
Alloperla leonardaTruncate Sallflies
0
0
Alloperla naninaSwannanoa Sallflies
0
0
Alloperla severaLittle Green Stoneflies
1
1
Species in Alloperla: Alloperla biserrata, Alloperla caudata, Alloperla delicata, Alloperla imbecilla, Alloperla leonarda, Alloperla nanina, Alloperla severa
22 species (Alloperla acadiana, Alloperla aracoma, Alloperla atlantica, Alloperla banksi, Alloperla caddo, Alloperla chandleri, Alloperla chloris, Alloperla concolor, Alloperla fraterna, Alloperla furcula, Alloperla hamata, Alloperla idei, Alloperla medveda, Alloperla natchez, Alloperla neglecta, Alloperla ouachita, Alloperla pilosa, Alloperla roberti, Alloperla serrata, Alloperla usa, Alloperla voinae, and Alloperla vostoki) aren't included.