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. (1976) The genus Beloneuria (Plecoptera: Perlidae). Annals of the Entomological Society of America 69, 1120–1124.