Schizura unicornis - Hodges#8007
 
 
 
(Unicorn Caterpillar Moth) - imm.
 
 
 
Size: approx. 10-15 mm. Photo: 09/11/11, noon.


An interesting caterpillar of a grayish moth. This is the Unicorn Caterpillar (Schizura unicornis). Caterpillars in this genus can spray a jet of formic acid over several inches from a gland in the hump. I found this specimen on a rose leaf and luckly did not experience the formic acid welcome. 
 

 
bug guide (these photos):
http://bugguide.net/node/view/574803