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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.

Ventral view of a Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Larva from the Yakima River in Washington
With a bit of help from the microscope, this specimen keys clearly and unsurprisingly to Hydropsyche.
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 Ceraclea transversa (Scaly-Wing Sedges)

Where & when

Time of year : Summer

This species is very abundant in the Northeast.

In 86 records from GBIF, adults of this species have mostly been collected during July (31%), June (29%), August (21%), May (9%), and September (6%).

In 39 records from GBIF, this species has been collected at elevations ranging from 255 to 4560 ft, with an average (median) of 1411 ft.

Species Range

Hatching behavior

Time of day : Evening

Larva & pupa biology

Current speed: Slow

Start a Discussion of Ceraclea transversa


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

Caddisfly Species Ceraclea transversa (Scaly-Wing Sedges)

Species Range
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