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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 Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington
This species was fairly abundant in a February sample of the upper Yakima.
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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Yellow Stoneflies

This common name refers to only one genus. Click its scientific name to learn more.

Stonefly Genus Isoperla

These are often called Yellow Stoneflies.
This is a very common trout stream stonefly genus. It is also huge, with sixty species scattered over the entire continent. Though anglers usually call them Little Yellow Stones or Yellow Sallies, the scientific common name for this genus is Stripetail. The latter is probably better to use as not all of them are necessarily little or yellow.
Isoperla fulva (Perlodidae) (Yellow Sally) Stonefly Adult from the  Touchet River in Washington
Dorsal view of a Isoperla (Perlodidae) (Stripetails and Yellow Stones) Stonefly Nymph from unknown in Wisconsin

Yellow Stoneflies

Scientific Name
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