Phanerotoma sp..
 
 
 
Size: approx. 10 mm. Photo: 11/20/11, 9 pm.


The genus Phanerotoma has 14 species in North America. The wasps in this subfamily parasitize caterpillars of Lepidoptera, especially Pyraloidea and Tortricoidea. Their antennae have 23 segments. The three photos show the same specimen. 
 

  
 
bug guide (this photo):
http://bugguide.net/node/view/596408