In 25 records from GBIF, adults of this species have mostly been collected during July (72%), August (12%), and April (8%).
In 8 records from GBIF, this species has been collected at elevations ranging from 649 to 2221 ft, with an average (median) of 1519 ft.
Time of day: Evenings
Habitat: Riffled areas
Current speed: Fast to moderate
Substrate: Rocks and gravel
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 species of the fuscata group (now a synonym of Drunella walkeri); very close to E. cornuta (now a synonym of Drunella cornuta), but considerably smaller.
Head and thorax deep blackish brown. Pleura tinged with reddish below the bases of the wings. Legs light brown, tinged with ruddy basally. Wings hyaline, venation pale; cross veins almost invisible. Abdominal tergites smoky brown; posterior margins darker brown; dark brown oval patches, rather indistinct, situated laterally. Sternites light olive brown; posterior sternites reddish brown, opaque. Forceps dull brownish, the third joint relatively shorter than in cornuta. Penes as in fig. 153. Tails dull whitish, the joinings faintly reddish brown.
Nymph very much resembles a small cornuta (now a synonym of Drunella cornuta), but is darker in color, varying from dark reddish brown to brownish black. The frontal horn is considerably more strongly incurved. The tibial ‘thumb’ of the fore leg is short and blunt, not curving outward as in cornuta. Other structural characters as in cornuta. A dark basal spot is present on the tibia, also a dark median band; tarsus dark basally. Tails yellowish brown.