A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, México

by William Edward Duellman

1954. Definition of some little-understood members of the leptodactylid genus Syrrhophus, with a description of a new species. Copeia, 1954 (1):48-58.

Firschein, I. L., and Smith, H. M.

1957. A high-crested race of toad (Bufo valliceps) and other noteworthy reptiles and amphibians from southern Mexico. Herpetologica, vol. 13 (3):219-222.

Fugler, C. M., and Webb, R. G.

1957. Some noteworthy reptiles and amphibians from the states of Oaxaca and Veracruz. Herpetologica, vol. 13 (2):103-108.

Gloyd, H. K.

1940. The rattlesnakes, genera Sistrurus and Crotalus. Chicago Acad. Sci. Special Publ., No. 4, vii + 266 pp., pls. 1-31.

Goin, C. J.

1958. Comments upon the origin of the herpetofauna of Florida. Quart. Jour. Florida Acad. Sci., vol. 21 (1):61-70.