Agallia constricta.
 
 
 
Size: approx. 3-4 mm. Photo: 05/28/12, 10 pm.


Agallia constricta is one of 14 North American species in this genus. The nymphs in this genus have characteristic ear-like nodules between their eyes. A very similar species is A. quadripunctata which has wider wings than A. constricta. The number of dark spots seems to be a less important feature.  
 
 
bug guide (this photo):
http://bugguide.net/node/view/648624