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.

Of all the pools I've fished, this one was most deserving of the colorful little brook trout it held.

From Mystery Creek # 89 in New York

Stream photos

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Tricorythodes (Trico) Mayfly Nymph Tricorythodes (Trico) Mayfly Nymph

Dorsal view of a Tricorythodes (Leptohyphidae) (Trico) Mayfly Nymph from Mystery Creek #308 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 Himalopsyche phryganea (Green Sedges)

Where & when

Preferred waters: Small streams

This is the only American species of Himalopsyche, but it can be common in the Pacific Northwest.

In 4 records from GBIF, adults of this species have been collected during June (50%) and April (50%).

Species Range

source

Map of specific collection sites

Start a Discussion of Himalopsyche phryganea

References

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