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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.

Stonefly Genus Sweltsa (Sallflies)

Only Sweltsa coloradensis has been specifically mentioned as a common species in my sources.

Specimens of the Stonefly Genus Sweltsa

6 Adults
2 Female Adults
4 Nymphs

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Taxonomy
Species in Sweltsa
Sweltsa borealisSallfly11
Sweltsa coloradensisSallfly00
Sweltsa fidelisSallfly38
Sweltsa onkosSallfly18
24 species (Sweltsa adamantea, Sweltsa albertensis, Sweltsa californica, Sweltsa continua, Sweltsa cristata, Sweltsa exquisita, Sweltsa guafini, Sweltsa hondo, Sweltsa lamba, Sweltsa lateralis, Sweltsa mediana, Sweltsa naica, Sweltsa occidens, Sweltsa oregonensis, Sweltsa pacifica, Sweltsa pisteri, Sweltsa pocahontas, Sweltsa resima, Sweltsa revelstoka, Sweltsa tamalpa, Sweltsa townesi, Sweltsa umbonata, Sweltsa urticae, and Sweltsa voshelli) aren't included.
Genus Range
Common Name
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