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One of the numerous toads to be found when the monsoon season occurs.
Sorry, forgot the link. http://en.wikipedia.org/wiki/Great_Plain...
It looks like it might be a Great Plains Toad. Like tiberio said, in the Bufonidae family , Bufo cognatus. I have 5 or 6 of these in my courtyard and I'm not too far from where you spotted this critter.
Bufonidae family, maybe Bufo genus
Lat: 34.40, Long: -103.21
Spotted on Sep 8, 2011 Submitted on Sep 8, 2011