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.

Stream photos

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Kogotus Stonefly Nymph Kogotus Stonefly Nymph

Dorsal view of a Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington

This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.

8 Recently Added Photos

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 intermedium (Saddle-case Makers)

Where & when

Time of year : March through August

Preferred waters: Streams and spring ponds

This species is spread out across the continent, but most abundant in the Midwest.

In 86 records from GBIF, adults of this species have mostly been collected during June (30%), July (28%), April (12%), May (8%), March (7%), and August (6%).

In 50 records from GBIF, this species has been collected at elevations ranging from 7 to 6322 ft, with an average (median) of 266 ft.

Species Range

source

Map of specific collection sites

Start a Discussion of Glossosoma intermedium

References

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