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 James, A.M. (1976) Two new species of Leuctra, with notes on the ferruginea group (Plecoptera: Leuctridae). Annals of the Entomological Society of America 69, 882–884.