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.

This is one of the many shallow, unnamed lakes in the Arctic coastal plain near the Dalton Highway.

From Dalton Highway in Alaska

Stream photos

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Coleoptera (Beetle) Insect Larva Coleoptera (Beetle) Insect Larva

Lateral view of a Coleoptera (Beetle) Insect Larva from Sears Creek in Washington

6 Recently Added Photos

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.

Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

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

Female Chauliodes rastricornis (Fishfly) Hellgrammite Adult

10 Pictures

Lateral view of a Female Chauliodes rastricornis (Corydalidae) (Fishfly) Hellgrammite Adult from Devil's Creek in Wisconsin

Collected June 13, 2021 from Devil's Creek in Wisconsin

Added by Troutnut on June 21, 2021

Collected June 13, 2021 from Devil's Creek in Wisconsin and added by Troutnut on June 21, 2021

Start a Discussion of Chauliodes rastricornis

References

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.