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 Harper, P.P. & Kirchner, R.F. (1978) A new stonefly from West Virginia (Plecoptera: Chloroperlidae). Proceedings of the Entomological Society of Washington 80, 403–406.