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.
Described by Stark, B.P. & Stewart, K.W. (1983) New records and descriptions of Alloperla (Plecoptera: Chloroperlidae) from the Ozark-Ouachita region. Entomological News 94, 55–59.