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.
Preferred waters: Small streams, generally in the mountains
In 205 records from GBIF, adults of this genus have mostly been collected during June (21%), May (18%), July (15%), September (13%), August (10%), October (7%), and April (7%).
In 53 records from GBIF, this genus has been collected at elevations ranging from 69 to 9318 ft, with an average (median) of 2559 ft.
Current speed: Fast
Environmental tolerance: Requires cold water