Based on the lack of coloration and the two bars on the last tergite (Tergite: The top (dorsal) part of a single segment on an insect's abdomen when it consists of a single chitinous plate (sclerite), or an individual sclerite if the segment has more than one.) this may be Rhithrogena virilis.
This mayfly was collected from Hungry Horse Creek on May 12th, 2005 and added to Troutnut.com on June 28th, 2011.
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