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.
While relatively rare in most of western Montana, it is common in several small streams along the east side of Flathead Lake and streams on the south side of the Flathead Indian Reservation.
This mayfly was collected from Yellow Bay Creek in Montana on June 25th, 2008 and added to Troutnut.com by Bnewell on June 28th, 2011.