Mythimna unipuncta - Hodges#10438 (Armyworm).
 
 
 
Size: approx. 30 mm. Photo: 11/22/11, 11 pm.


The Armyworm (Mythimna unipuncta) is a very common moth throughout most of North America. Its English name refers to the caterpillars which eat until there is nothing left and then "march" by the thousands to a new food source. 
 

 
bug guide (these photos):
http://bugguide.net/node/view/597352