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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.

Lateral view of a Psychodidae True Fly Larva from Mystery Creek #308 in Washington
This wild-looking little thing completely puzzled me. At first I was thinking beetle or month larva, until I got a look at the pictures on the computer screen. I made a couple of incorrect guesses before entomologist Greg Courtney pointed me in the right direction with Psychodidae. He suggested a possible genus of Thornburghiella, but could not rule out some other members of the tribe Pericomini.
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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Stonefly Species Isogenoides olivaceus (Olive Springflies)

This is a common olive brown species according to Swisher and Richards in Selective Trout. The Stoneflies of the United States page leaves me somewhat skeptical of the identification, however.

Where & when

Time of year : May through June

Species Range

Egg-Laying behavior

Time of day: Midday


Start a Discussion of Isogenoides olivaceus

References

Stonefly Species Isogenoides olivaceus (Olive Springflies)

Taxonomy
Species Range
Common Names
Resources
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