Euthochtha galeator (Helmeted Squash Bug) ♂.
 
 
 
Size: approx. 15 mm. Photo: 06/28/12, noon.


This Helmeted Squash Bug (Euthochtha galeator) is widespread from the Texas/Dakota line eastwards. It feeds on various plants and can become a pest damaging roses, citrus, as well as other fruits and ornamentals. This specimen is a male with a characteristic white spur or flap on the side of its thorax.  
 

 
bug guide (these photos):
http://bugguide.net/node/view/665056
UF:
http://entnemdept.ufl.edu/creatures/orn/flowers/euthochtha_galeator.htm