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.
maybe a bucktail bodied inchworm type fly that used to be popular before foam became regularly used for terrestrials?
Roger...Are you sure that these guys (insects) are not somehow smarter than we are and are just playing dumb waiting for our species to peter itself out and the planet will then be all theirs?