7060. _El Quiche_: Nebaj,
UMMZ 89202.

LITERATURE CITED

BOULENGER, G. A.

1894. Catalogue of the snakes in the British Museum (Natural
History). London, 2:xi + 382 pp., pls. 1-20.

COPE, E. D.

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