Pituophis catenifer affinis, commonly known as the Sonoran gopher snake, is a nonvenomous subspecies of colubrid snake that is endemic to the southwestern United States. It is one of six recognized subspecies of the gopher snake, Pituophis catenifer.[5]
^Schmidt, K.P., and D.D. Davis. 1941. Field Book of Snakes of the United States and Canada. G.P. Putnam's Sons. New York. 365 pp. (Pituophis sayi affinis, pp. 163-164 + Figure 46. on p. 161.)
^Wright, A.H., and A.A. Wright. 1957. Handbook of Snakes of the United States and Canada. Comstock. Ithaca and London. 1,105 pp. (in 2 volumes) (Pituophis catenifer affinis, pp. 593-597, Figure 172. + Map 46. on p. 589.)
^Conant, R. 1975. A Field Guide to Reptiles and Amphibians of Eastern and Central North America, Second Edition. Houghton Mifflin. Boston. 429 pp. ISBN 0-395-19977-8 (paperback). (Pituophis melanoleucus affinis, p. 201 + Map 147.)
^The Reptile Database. www.reptile-database.org.
^Integrated Taxonomic Information System (ITIS). www.itis.gov.
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