Cesonia bilineata.
 
 
 
Size: approx. 4-5 mm. Photo: 08/08/12, 11 am.


This tiny ground spider is Cesonia bilineata. The genus has ten species in the US but C. bilineate is the only one in the eastern half of the country. 
 

 
bug guide (these photos):
http://bugguide.net/node/view/686666