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 is an interesting Heptageniid mayfly since in western Montana it is only found in cold lakes, especially those in Glacier National Park.
This mayfly was collected from Kintla Lake in Montana on July 31st, 2007 and added to Troutnut.com by Bnewell on June 26th, 2011.