This species is known from south-central United States (north to Kansas, south through Oklahoma and Texas) to extreme northeastern Mexico (Conant and Collins 1991, Collins 1993, Lemmon et al. 2007). In Mexico it is only known from the lower Rio Grande Valley in Tamaulipas, west to Matamoros, in extreme northeastern Tamaulipas. It was reported from Colfax County, northeastern New Mexico, apparently extending range about 325 km west (Herp. Rev. 22:64), but that specimen was later identified as P. triseriata (Degenhardt et al. 1996) [now P. maculata].