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Proxys sp
Mating shield bugs
I apologize, but I was wrong with my first suggestion!
Pentatomidae, Pentatominae, most probably Mormidea notulata.
http://www.projectnoah.org/spottings/361...
I just add some more links as a "working document".
http://lhldigital.lindahall.org/cdm/comp...
http://digitalcommons.unl.edu/cgi/viewco...
http://colpospuebla.mx/documentos/produc...
Pentatomidae, Proxys sp., but definitely NOT Punctulata, which has black "knees"! I have seen this a lot, but unfortunately none with an ID.
http://entnemdept.ufl.edu/creatures/misc...