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 Kondratieff, B.C. & Kirchner, R.F. (1982) Taeniopteryx nelsoni, a new species of winter stonefly from Virginia (Plecoptera: Taeniopterygidae). Journal. Kansas Entomological Society 55, 1–7.