 The southern edge of the "S. hispidus" distribution is likely near the Rio Grande, where it meets the northern distribution of "S. toltecus" (formerly "S. h. toltecus").The northern extent of "S. hispidus" distribution is to the Platte River in Nebraska and from Arizona to Virginia.Adult size is total length 202–340 mm (7.9–13 in); tail 87–122 mm (3.4-4.8 in), frequently broken or stubbed; hind foot 29–35 mm (1-1.3 in); ear 16–20 mm (0.6-0.9 in); mass 50-250 g (1.7-9 oz).