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.
Time of year : August through October; best from late August through September
Preferred waters: Lakes and rivers, warm and cool. Alkaline waters produce the best hatches.
In 55 records from GBIF, adults of this genus have mostly been collected during August (35%), July (35%), September (18%), and June (9%).
In 32 records from GBIF, this genus has been collected at elevations ranging from 618 to 6250 ft, with an average (median) of 3533 ft.
Time of day: Dusk
Current speed: Slow to medium
Substrate: Silt or clay
Environmental tolerance: High tolerance for temperatures warmer than trout can stand; low tolerance for pollution