FOX, W.
1951. The status of the gartersnake, _Thamnophis sirtalis tetrataenia_. Copeia, 1951:257-267.
FOUQUETTE, M. J., and LINDSAY, H. L., JR.
1955. An ecological survey of reptiles in parts of northwestern Texas. Texas Jour. Sci., 7(4):402-421.
HUDSON, G. E.
1942. The amphibians and reptiles of Nebraska. Nebraska Conserv. Bull. No. 24, pp. 1-146.
LITTLE, E. L., JR., and KELLER, J. G.
1937. Amphibians and reptiles from the Jornada Experimental Range, New Mexico. Copeia, 1937 (4):402-421.
MASLIN, T. P.
1959. An annotated check list of the amphibians and reptiles of Colorado. Univ. Colorado Studies, Ser. Biol. No. 6, 98 pp.
RUTHVEN, A. G.
1908. Variations and genetic relationships of the garter-snakes. Bull. U. S. Nat. Mus., 61:xii + 201 pp.
SCHMIDT, K. P.
1953. A check list of North American amphibians and reptiles.
Univ. Chicago Press, vii + 280 pp.
SMITH, H. M.
1942. The synonymy of the garter snakes (_Thamnophis_), with notes on Mexican and Central American species. Zoologica, 27(17):97-123.
1956. Handbook of amphibians and reptiles of Kansas (2nd ed.).
Univ. Kansas Mus. Nat. Hist. Misc. Publ. No. 9, 356 pp.
SMITH, H. M., and BROWN, B. B.
1946. The ident.i.ty of certain specific names in _Thamnophis_.
Herpetologica, 3:71-72.
SMITH, H. M., and TAYLOR, E. H.
1945. An annotated check list and key to the snakes of Mexico.
Bull. U. S. Nat. Mus., 187, 239 pp.
STEBBINS, R. C.
1954. Amphibians and reptiles of western North America.
McGraw-Hill Book Co., Inc., xxiv + 528 pp.
VAN DENBURGH, J.
1924. Notes on the herpetology of New Mexico, with a list of the species known from the state. Proc. California Acad. Sci., 4th ser., 13(12):189-250.
VAN DENBURGH, J., and SLEVIN, J.
1918. The garter-snakes of Western North America. Proc.
California Acad. Sci., 4th ser., 8:181-270.
WOODBURY, A. M.
1931. A descriptive catalog of the reptiles of Utah. Univ.
Utah Biol. Ser., 1(4):1-129.
WRIGHT, A. H., and WRIGHT, A. A.
1957. Handbook of snakes of the United States and Canada.
Comstock Publ. a.s.sociates, Cornell Univ. Press, vol. 2, pp. i + ix and 565-1106.
_Transmitted November 8, 1960._