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 209 records from GBIF, adults of this genus have mostly been collected during July (19%), June (19%), August (18%), May (14%), April (10%), and September (8%).
In 173 records from GBIF, this genus has been collected at elevations ranging from 20 to 12402 ft, with an average (median) of 4288 ft.
Time of day: Dusk
They have distinctive flight patterns consisting of foot-long, fast vertical undulations as if they were suspended on invisible rubber bands.
The natural spinner's tails are widely spread, and this trait should be copied on all imitations.
Current speed: Still or slow
Substrate: Vegetation, silt