Melanoliarus sp..
 
 
 
Size: approx. 10 mm. Photo: 06/11/12, 10 pm.


These planthoppers belong to the genus Melanoliarus (formerly Oliarus, which is now considered an Old World genus). I believe the two photos show different species but unfortunately this genus has around 50 different species in North America. Both specimen were attracted to the light of our living room window.  
 

 
bug guide (large photo):
http://bugguide.net/node/view/655867
bug guide (small photo):
http://bugguide.net/node/view/655866


Melanoliarus quinquelineatus or vicarius.
 
 
 
Photo: 06/07/15, 11 pm.


The genus has about 48 species in North America, so I am glad that the experts on bugguide could narrow it down to two.  
 
 
bug guide (this photo):
https://bugguide.net/node/view/1080372