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 1 records from GBIF, adults of this species have been collected during June (100%).
To determine whether a specimen of Drunella belongs to Drunella pelosa, use the Key to Species of Drunella Nymphs.