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Mayfly #1

Mayfly #1
Pennsylvania, USA
June 3, 2013
One of a zillion on a quick store window.

I agree with Kurt on the genus Nixe.

Moved from Mayflies.

I believe this male imago to be of family Heptageniidae, and suspect it might be genus Heptagenia, or (as fellow aquatic entomology/taxonomy enthusiast Kurt Schirmer suggested on my flyfishing entomology forum), Nixe. However, I am preliminarily placing it in the guide at family level.

Moved for expert attention
Moved from ID Request.

More specific location information for both images would be appreciated.

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