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 10 records from GBIF, adults of this species have been collected during September (30%), August (30%), June (20%), October (10%), and July (10%).
In 9 records from GBIF, this species has been collected at elevations ranging from 2702 to 10492 ft, with an average (median) of 9760 ft.
Time of day: Midday
Current speed: Medium to fast
Substrate: Gravel or rocks
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 with amber-tinged wings; spines on inner margin of penes only.
Head purplish brown. Thorax rather bright red-brown; mesonotum yellowish brown, median stripe darker red-brown. Postero-lateral areas of mesonotum on each side of and posterior to scutellum, and lateral areas of metanotum, purplish brown. Narrow purplish markings above leg bases. Median area of mesosternum darker than pleura. Legs reddish brown; fore leg tinged with smoky. All femora with distinct reddish tinge; apex of fore tibia blackish; femora-tibial joinings purplish brown, tarsal joinings narrowly dark brown, on all legs. Wings hyaline, distinctly amber tinged throughout. Veins rather fine, reddish brown.
Abdominal segments 2-7 and basal portion of 8, semi-hyaline; hyaline areas of tergites light red-brown, the posterior half or two-thirds of each purplish brown. Tergite 2 almost wholly dark except for narrow hyaline anterior margin; 2/3 of tergite 3, and about 1/2 of tergites 4-7, dark-shaded, the dark color often concentrated in postero-lateral areas. Pale submedian streaks outlined in darker color are faintly indicated on basal tergites. Sternites greyish with tinge of pale brown; no distinct darker median markings on 2-6. Segments 9 and 10, and apical portion of 8, opaque; tergites red-brown, sternites paler. Ganglionic areas of sternites 7-9 opaque, pale red-brown. Forceps deep olive or smoky brown; penes light red-brown; a curved spine on inner margin of each side of penes (see fig. 103). Tails deep smoky brown.