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Looks like some sort of egg casing.
Sweetwater Wetlands, Tucson, AZ
Probably mantis religiosa ootheca, the species is widespread in US and there is a strong population in Arizona http://bugguide.net/node/view/457073/bgi...
mantis egg case - not sure exactly which species, though
Spotted on Nov 27, 2012 Submitted on Dec 6, 2012