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.
This abundant genus has three important East/Midwest species. The superabundant species in the West have been moved to the new genera Calineuria and Hesperoperla.
Where & when
In 163 records from GBIF, adults of this genus have mostly been collected during May (44%), June (23%), and April (21%).
In 50 records from GBIF, this genus has been collected at elevations ranging from 20 to 10663 ft, with an average (median) of 1721 ft.