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 539 records from GBIF, adults of this genus have mostly been collected during June (26%), July (19%), May (18%), August (15%), September (8%), and April (6%).
In 164 records from GBIF, this genus has been collected at elevations ranging from 26 to 8301 ft, with an average (median) of 1240 ft.