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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Limnephilus (Summer Flier Sedge) Caddisfly Larva Limnephilus (Summer Flier Sedge) Caddisfly Larva

Case view of a Limnephilus (Limnephilidae) (Summer Flier Sedge) Caddisfly Larva from the Yakima River 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 Rhyacophila narvae (Green Sedges)

Where & when

Time of year : Early summer

Preferred waters: Small mountain streams

In 17 records from GBIF, adults of this species have been collected during June (29%), July (29%), August (12%), May (12%), April (12%), and March (6%).

In 2 records from GBIF, this species has been collected at elevations of 197 and 6726 ft.

Species Range

source

Map of specific collection sites

Hatching behavior

Time of day : Morning

Egg-Laying behavior

Time of day: Morning

Start a Discussion of Rhyacophila narvae

References

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