Chapter 2

1860. Descriptions of reptiles from tropical America and Asia. Proc. Acad. Nat. Sci. Philadelphia, 1860:368-374.

1861. Contributions to the ophiology of Lower California, Mexico, and Central America. Proc. Acad. Nat. Sci. Philadelphia, 1861:292-306.

1887. Catalogue of the batrachians and reptiles of Central America and Mexico. Bull. U. S. Natl. Mus., 32: 1-98.

DUM['E]RIL, A. M. C.

1853. Prodrome g['e]n['e]ral de la classification des serpents. Mem. Acad. Sci. Inst. France, 23:399-536, 2 pls.

DUM['E]RIL, A. M. C., and BIBRON, G.

1854. Erp['e]tologie g['e]n['e]rale, ou histoire naturelle des reptiles. Paris, 7 (pt. 1): xvi + 780 pp.

FUGLER, C. M., and WEBB, R. G.

1956. Distributional notes on some reptiles and amphibians from southern and central Coahuila. Herpetologica, 12:167-171.

G[:U]NTHER, A.

1885-1902. Biologia Centrali-Americana. Reptilia and Batrachia. London, xx + 326 pp., pls. 1-76.

JAN, G.

1863. Elenco sistematico degli ofidi. Milan, 143 pp.

SCHMIDT, K. P., and SHANNON, F. A.

1947. Notes on amphibians and reptiles of Michoacan, Mexico. Fieldiana-Zool., 31 (9):63-85.

SLEVIN, J. R.

1939. Notes on a collection of reptiles and amphibians from Guatemala. I. Snakes. Proc. California Acad. Sci., 4th, ser., 23 (26):393-414, pls. 37-38.

SMITH, H. M.

1943. Summary of the collections of snakes and crocodilians made in Mexico under the Walter Rathbone Bacon Traveling Scholarship. Proc. U. S. Natl. Mus., 93:393-504.

1944. Snakes of the Hoogstraal Expeditions to northern Mexico. Zool. Ser. Field Mus. Nat. Hist., 29 (8):135-152.

SMITH, H. M., and TAYLOR, E. H.

1945. An annotated checklist and key to the snakes of Mexico. Bull. U. S. Natl. Mus., 187: iv + 239 pp.

1950. Type localities of Mexican reptiles and amphibians. Univ. Kansas Sci. Bull., 33 (8):313-380.

STUART, L. C.

1954. Descriptions of some new amphibians and reptiles from Guatemala. Proc. Biol. Soc. Washington, 67:159-178.

STULL, O. G.

1932. An annotated list of the forms of the genus _Pituophis_. Occas. Papers Mus. Zool. Univ. Michigan, 250:1-5.

1940. Variations and relationships in the snakes of the genus _Pituophis_. Bull. U. S. Natl. Mus., 175:vi + 225 pp.

_Transmitted February 2, 1960._

28-2493