Large, 4cm, black with bright red.
Carlos must update as per suggestion...
http://www.whatsthatbug.com/2009/06/03/l...
I know Thasus neocalifornicus from the southern U.S. and it ranges into Mexico, but I'm not sure if it goes as far south as your location. Then, there's Thasus gigas, which is fairly similar. Great looking bug, regardless!
Lat: 20.05, Long: -103.14
Spotted on Jul 7, 2012
Submitted on Jul 9, 2012