Anticarsia gemmatalis - Hodges#8574
(Velvetbean Caterpillar Moth).
Size: approx. 50 mm. Photo: 09/27/12, 9 pm.

The color of this species is highly variable. The wings heavily mottled or mostly unmarked with a stripe and/or prominent spots. The velvetbean caterpillar is the most serious foliage-feeding pest of soybean in the Southeast. 
bug guide (this photo):