Baird, S. F.

1859. Reptiles of the boundary. United States and Mexican Bound. Surv., 2, 1-35, 41 pls.

Baird, S. F., and Girard, C.

1853. Catalogue of North American reptiles in the Museum of the Smithsonian Institution. Smithson. Miscl. Col., part 1, Serpents., pp. xvi + 172.

Brown, B. C.

1950. An annotated check list of the reptiles and amphibians of Texas. Baylor Univ. Studies, pp. xii + 259.

Bundy, R. E.

1951. New locality records of reptiles in New Mexico. Copeia, 1951 (4):314.

Cockerell, T. D. A.

1910. Zoology of Colorado. Univ. of Colorado, Boulder, vii + 262 pp.

Conant, R.

1958. A field guide to the reptiles and amphibians of the United States and Canada east of the 100th Meridian. Houghton Mifflin Co., Boston, xviii + 366 pp.

Cope, E. D.

1900. The crocodilians, lizards and snakes of North America. Rept. U. S. Nat. Mus. for 1898, pp. 153-1270.

Fitch, H. S.

1941. Geographic variation in garter snakes of the species Thamnophis sirtalis in the Pacific Coast region of North America. Amer. Midland Nat., 26:570-592.

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 identity 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. Associates, Cornell Univ. Press, vol. 2, pp. i + ix and 565-1106.

Transmitted November 8, 1960.