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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.

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.
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 Psilotreta labida (Dark Blue Sedges)

See the Psilotreta genus page for more details that this important species shares with others in its genus.

Where & when

Time of year : Late April through June

This species is found up and down the eastern mountains. The hatch starts in late April in Virginia and finishes in northern New England in late June. It peaks in June in the Catskills, where it is especially well-known.

In 7 records from GBIF, adults of this species have been collected during June (57%) and May (43%).

Species Range

Hatching behavior

Time of day : Evening

Egg-Laying behavior

Time of day: Evening

Specimens of the Caddisfly Species Psilotreta labida

1 Male Adult
1 Larva

Start a Discussion of Psilotreta labida


Caddisfly Species Psilotreta labida (Dark Blue Sedges)

Species Range
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