Tolype? February 13th, 2012 Brownsville, Texas. On Pithecellobium dulce .. these are not, by my experience, full sized. The black band posterior to the head at perhaps the third segment (barely visible here) opens up into a velvety red gash if you can get the bug stimulated enough.. Mostly they are unimpressed with humans. These do not (cannot?) sting or cause skin irritation as far as I know. They form groups on the lower trunk during the day but forage all the way to the top for the very newest shoots late at night. Thanks for your help.