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.

Cedar sweepers line the fertile spring creek headwaters of a famous trout stream.

From the Bois Brule River in Wisconsin

Stream photos

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Limnephilus (Summer Flier Sedge) Caddisfly Larva Limnephilus (Summer Flier Sedge) Caddisfly Larva

Case view of a Limnephilus (Limnephilidae) (Summer Flier Sedge) Caddisfly Larva from the Yakima River in Washington

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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 Species Psychoglypha subborealis (Snow Sedges)

Where & when

Time of year : Fall and winter

Preferred waters: Streams and stillwaters of all sizes

This species is extremely widespread, coast-to-coast and north to Alaska, and it is found in any type of water.

In 65 records from GBIF, adults of this species have mostly been collected during April (23%), May (23%), October (12%), March (9%), September (8%), June (8%), and December (6%).

In 32 records from GBIF, this species has been collected at elevations ranging from 156 to 11499 ft, with an average (median) of 6079 ft.

Species Range

source

Map of specific collection sites

Start a Discussion of Psychoglypha subborealis

References

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