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Pentatomidae, Pentatominae, most probably Mormidea notulata.
http://www.projectnoah.org/spottings/124...
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...