Part 11

1958. A new genus of colubrid snake from the Upper Miocene of North America. Amer. Mus. Novitates, 1874:1-16. February 27.

COPE, E. D.

1861. Contributions to the ophiology of Lower California, Mexico and Central America. Proc. Acad. Nat. Sci. Philadelphia, 13:292-306. December 28.

1867. Fifth contribution to the herpetology of tropical America. Proc. Acad. Nat. Sci. Philadelphia, 18:317-323. February 20.

1871. Ninth contribution to the herpetology of tropical America. Proc. Acad. Nat. Sci. Philadelphia, 23(2):200-224. October 24.

1876. On the batrachia and reptilia of Costa Rica. Journ. Acad. Nat. Sci. Philadelphia, series 2, 8(4):93-154, 6 pls.

1895. The classification of the ophidia. Trans. Amer. Philos. Soc., 18:186-219, 33 pls. April 15.

1900. The crocodilians, lizards, and snakes of North America. Ann. Rept. U. S. Natl. Mus. for 1898, pp. 153-1270, 36 pls.

DITMARS, R. L.

1931. Snakes of the World. New York, The MacMillan Company, 1931. xi + 207 pp., 84 pls.

DOWLING, H. G.

1951. A proposed standard system of counting ventrals in snakes. British Journ. Herpetology, 1(5):97-99, fig. 1.

DUELLMAN, W. E.

1958. A preliminary analysis of the herpetofauna of Colima, Mexico. Occas. Papers Mus. Zool. Univ. Michigan, 589:1-22, March 21.

DUMERIL, A. M. C., BIBRON, G., AND DUMERIL, A. H. A.

1854. Erpetologie generale, ou histoire naturelle des reptiles. Paris, 7(pt. 2):xii + 785. February 25. Atlas, 24 pp., 108 pls.

DUMERIL, A. H. A., BOCOURT, M., AND MOCQUARD, F.

1870-1909. Mission Scientifique au Mexique et dans l'Amerique Centrale ... Etudes sur les Reptiles. Paris, vol. 2:xiv + 1012 pp., 77 pls.

GARMAN, S.

1884a. The North American reptiles and batrachians. Bull. Essex Inst., 16:1-46. January 9.

1884b. The reptiles and batrachians of North America. Mem. Mus. Comp. Zool., 8(3):xxxi + 185 pp., 9 pls. July.

GUeNTHER, A. C. L. G.

1858. Catalogue of colubrine snakes in the collection of the British Museum. London. xiv + 281 pp.

HUXLEY, J.

1942. Evolution. The Modern Synthesis. London. 645 pp.

JAN, G. AND SORDELLI, F.

1866. Iconographie Generale des Ophidiens. Milano. livr. 19, pls. 1-6. December.

1881. Iconographie Generale des Ophidiens. Milano. livr. 50, pls. 1-7. November.