Ballenger Creek Park, MD
Half of dozen of them sitting on the window glass of our office.
Myersville, Frederick County, Maryland
May 29, 2014
Identified to the genus level at this site: http://birdingnewbrunswick.ca/group/maritime-flies-diptera-and-allies/forum/topics/is-this-chrysops?xg_source=activity
As always, addition, corrections or confirmation appreciated.
(Chrysopilus quadratus) Myersville, Frederick County, Maryland. July 4, 2015. Female. bugguide.net/node/view/1096305#1930296