Maricopa Co., Arizona. August 16, 2014.
I have always associated Trimorphodon with canyons and other rocky areas, but this one was found crossing a road in a stretch of low desert. Formerly a subspecies of Trimorphodon biscutatus, elevated by Devitt et al. 2008.
Arizona 2014 Flickr album is here.
HerpMapper records for this species are here.