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 Baumann, R.W. & Grubbs, S.A. (1996) Two new species of Soyedina (Plecoptera: Nemouridae) from the Appalachian Mountains. Entomological News 107, 220–224.