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. & Szczytko, S.W. (1988) A new Malirekus species from eastern North America (Plecoptera: Perlodidae). Journal. Kansas Entomological Society 61, 195–199.