Spiderweb, Aiken County, South Carolina, USA October 3, 2009 Size: ~25mm
Notched eyes and clavate abdomen suggest Trypoxylon.
Size determined from measuring the leaf, that it is on, which is 1 1/2"(~38mm)long.
If my first assumption is correct, would the size place it in the subgenus Trypargilum?