The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
In 11 records from GBIF, adults of this species have been collected during June (45%), July (45%), and May (9%).
In 4 records from GBIF, this species has been collected at elevations of 3, 69, 240, and 643 ft.
Time of day: Late afternoon
Current speed: Slow
Environmental tolerance: Tolerant of warm water
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.
This is a white-winged, white-legged, white-tailed species with dark brown thorax and brown tipped white abdomen. Head, thorax, and basal segment of the abdomen brown, darker above and beneath, with paler sutures at the sides. All appendages white. Wings white with whitish veins and with scarcely any darkening of the stigmatic area. Costal cross veins almost undiscoverable except in the stigmatic area where they are rather crowded, strongly aslant, sinuous, and sometimes forked. Segments 2 to 7 of the abdomen entirely translucent white, with no markings on either ganglia or spiracles. Segment 8 is pale brown, 9 and 10 are somewhat darker brown. Forceps and tails white. Penes pale brown, separated by a narrow cleft; each tip bears externally a thin, flat, triangular lobe that terminates laterally in a sharp, upcurving thorn-like point (see fig. 133).