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.
In 74 records from GBIF, adults of this genus have mostly been collected during May (34%), June (24%), April (15%), July (14%), and August (7%).
In 57 records from GBIF, this genus has been collected at elevations ranging from 240 to 10971 ft, with an average (median) of 4524 ft.
Most physical descriptions on Troutnut are direct or slightly edited quotes from the original scientific sources describing or updating the species, although there may be errors in copying them to this website. Such descriptions aren't always definitive, because species often turn out to be more variable than the original describers observed. In some cases, only a single specimen was described! However, they are useful starting points.
A medium-sized species, wings tinged with light grey, darker at bases; dark midventral ganglionic marks.
Thoracic notum light pitch-brown, “sometimes approaching light luteo-piceous anteriorly at the sides” (Eaton). Legs sooty to golden brown; base of fore femur and trochanter somewhat paler, base of first fore tarsal joint darker. Wings hyaline, “tinted with light bistre-grey throughout, but with a stronger tint than elsewhere” at the wing roots and in the stigmatic area; near wing roots the color becomes rather dark brown. Venation yellowish brown.
Abdominal segments 2-7 semi-hyaline; tergites largely light brown, the anterior ‘margins, antero-lateral areas, narrow median line and submedian streaks being hyaline, “dirty-whitish.” The three pale longitudinal streaks are outlined in darker color. Sternites paler, the ganglionic areas on 3-7 conspicuously marked with sepia-brown. Segments 8-10 opaque; tergites “Vandyke-brown,” sternites “very light brownish ochre” (Eaton). Tails brown. A large spine on lower outer margin of penes on each side, smaller spine on inner margin (see fig. 103).
This species is allied to both C. confusa and hyalina, also to the eastern C. atlantica. Distinguishing features are indicated under each of these species.