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. & Olson, C.A. (1984) Confirmation of the stonefly genus Anacroneuria (Plecoptera: Perlidae) from the Nearctic region with the description of a new species from Arizona. The Southwestern Naturalist 29, 489–492.