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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.

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 Cheumatopsyche pettiti (Little Sister Sedges)

This is the second most important species of Cheumatopsyche.

Where & when

Time of year : Late spring through midsummer; peaks in May in the East, June or July in the West

Preferred waters: Small streams and rivers

This species is found across the country, including Hawaii.

In 40 records from GBIF, adults of this species have mostly been collected during June (38%), July (25%), August (18%), and May (13%).

Start a Discussion of Cheumatopsyche pettiti


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