The Gopher Snakes are classified in the following subspecies:
Sonoran Gopher snake - Pituophis catenifer
affinis
San Diego Gopher snake - Pituophis catenifer annectens
Pazific Gopher snake - Pituophis catenifer catenifer
Great Baisin Gopher snake - Pituophis catenifer deserticola
Cape Gopher snake - Pituophis catenifer vertebralis
Baja California Gopher snake - Pituophis catenifer bimaris
San Martin Island Gopher snake - Pituophis catenifer fulginatus
Credos Island Gopher snake - Pituophis catenifer insulanus
Santa Cruz Gopher snake - Pituophis catenifer pumilis
Island Gopher snake - Pituophis catenifer coronalis
The western subspecies belong to this group.