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Rhodobaenus quinquepunctatus
Red with black beetle, about 25 mm (one inch). At night.
Semi tropical.
Variable in pattern, as R. quinquepunctatus - but the northern one never half-black like here.
Thank you Keith Roragen for the ID and the link. I'm pretty sure it is the same one.
It looks an awful lot like a Cocklebur Weevil - Rhodobaenus quinquepunctatus. I haven't been able to determine if that species is found in Mexico, but it has to be in the same genus.
http://bugguide.net/node/view/160916