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.

View from atop the permafrost slump

From the Selawik River in Alaska

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 Glossosoma nigrior (Saddle-case Makers)

This is an important caddisfly in the East and Midwest, and the most abundant species in the entire order on some waters. Its small size (hook size 20-22) makes it less significant than larger abundant species.

Where & when

Time of year : May through June

In 68 records from GBIF, adults of this species have mostly been collected during May (25%), June (24%), July (21%), August (13%), and September (9%).

In 46 records from GBIF, this species has been collected at elevations ranging from 95 to 5103 ft, with an average (median) of 1234 ft.

Species Range

source

Map of specific collection sites

Hatching behavior

Time of day : Evening

Egg-Laying behavior

Time of day: Evening

Larva & pupa biology

Substrate: Gravel

Discussions of Glossosoma nigrior

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References

LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.
Swisher, Doug and Carl Richards. 2000. Selective Trout. The Lyons Press.