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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Onocosmoecus (Great Late-Summer Sedge) Caddisfly Larva Onocosmoecus (Great Late-Summer Sedge) Caddisfly Larva

Lateral view of a Onocosmoecus (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Larva from the Yakima River in Washington

This specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.

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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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Hellgrammite Genus Chauliodes (Fishflies)

Where & when

In 428 records from GBIF, adults of this genus have mostly been collected during June (14%), July (14%), August (14%), May (12%), September (11%), April (9%), March (7%), and February (6%).

In 56 records from GBIF, this genus has been collected at elevations ranging from 3 to 12631 ft, with an average (median) of 778 ft.

Specimens of the Hellgrammite Genus Chauliodes

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

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.
Usinger, R.L. 1956. Aquatic Insects California, with keys to North American Genera and California species. University of California Press.