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 7 records from GBIF, adults of this species have been collected during June (43%), May (29%), April (14%), and July (14%).
In 1 record from GBIF, this species has been collected at elevation of 1700 ft.
Current speed: Slow to medium
Substrate: Gravel to small cobble.
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.
Very similar to Cinygmula mimus, differing principally in the maculation of the wings. Head and thorax brown, the latter with the usual lighter brown shading in the region anterior to scutellum and with the pleura streaked with light ochreous; a faint ruddy patch anterior to base of forewing. Abdomen dorsally with the anterior half of segments II-VII hyaline, the posterior halt irregularly, purple-brown (deeper in color than in mimus), segments VIII-X opaque, largely purple-brown, with lighter brown shades along lateral edges, and also on posterior margin of X. Ventrally with much the same coloration, but considerably paler, genital plate light ochre-brown; traces of ganglionic marks. Forceps and setae light smoky. Legs pale brown, the femora with faint ruddy tinges. Wings entirely suffused with pale amber, veins and crossveins brown, the latter broadly but rather faintly bordered with pale smoky, giving a very characteristic checkered appearance to the entire wings, a feature not at all present in mimus. The male genitalia are so very similar to those of mimus that no definite character for separation can be given, unless it be that the stimuli are somewhat larger.