We believe this is in the family Bombyliidae.
Based on wing venation, facial shape, and antennae, the closest match we found was the genus Neodiplocampta, as illustrated at 6.2 in Herschel Raney's key
here. The wing pattern resembles N. paradoxa, but is not a perfect match.
The third antenna segment on our specimen appears to have a deep notch at the base, but this feature was not discussed in any of our resources.
Help with the proper placement of this specimen would be appreciated.
Gayle
Update: Based on the images mentioned in Edward Trammel's comment (below), we now believe this fly is in the genus Villa. It is an excellent match for those images, especially the bright orange color associated with the major wing veins. Also it is consistant with the Villa description at 6.5 in Herschel Raney's key
here.
Gayle
Update #2 See "--- Back to the drawing board" below