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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 Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington
This species was fairly abundant in a February sample of the upper Yakima.
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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Hellgrammite Species Chauliodes rastricornis (Fishflies)

Where & when

In 277 records from GBIF, adults of this species have mostly been collected during April (11%), June (11%), May (11%), July (11%), August (10%), March (10%), September (10%), February (8%), October (5%), and December (5%).

In 41 records from GBIF, this species has been collected at elevations ranging from 3 to 5203 ft, with an average (median) of 778 ft.

Specimens of the Hellgrammite Species Chauliodes rastricornis

1 Female Adult

Start a Discussion of Chauliodes rastricornis


  • Brigham, W.U., A.K. Brigham, and A. Gnilke. 1982. Aquatic Insects and Oligochaetes of North and South Carolina. Midwest Aquatic Entomologist.
  • Stehr, Frederick W. 1998. Immature Insects. Kendall/Hunt Publishing Company.

Hellgrammite Species Chauliodes rastricornis (Fishflies)

Common Names
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