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.

A trackless paradise two days deep in the Yellowstone backcountry

From Mystery Creek # 218 in Wyoming

Stream photos

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Sweltsa (Sallfly) Stonefly Nymph Sweltsa (Sallfly) Stonefly Nymph

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.

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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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Caddisfly Genus Psychomyia (Dinky Purple Breasted Sedges)

Where & when

In 142 records from GBIF, adults of this genus have mostly been collected during June (25%), July (22%), May (16%), August (15%), and September (6%).

In 94 records from GBIF, this genus has been collected at elevations ranging from 20 to 8924 ft, with an average (median) of 2723 ft.

Genus Range

source

Map of specific collection sites

Start a Discussion of Psychomyia

References

LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.