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.
This one hatched in the middle of July, which is very late for this species.
This mayfly was collected from unknown in Wisconsin on July 14th, 2004 and added to Troutnut.com by Troutnut on January 25th, 2006.