Part 12

1958. A field guide to reptiles and amphibians. Houghton-Mifflin Co. Boston. 366 pp.

COPE, E. D.

1866. On the structures and distribution of the genera of the arciferous Anura. J. Acad. Nat. Sci. Philadelphia, n. ser., 6:67-112.

1877. Tenth contribution to the herpetology of tropical America. Proc. Amer. Philos. Soc., 17:85-98.

1878. New genus of Cystignathidae from Texas. Amer. Nat., 12:252-53.

1879. Eleventh contribution to the herpetology of tropical America. Proc. Amer. Philos. Soc., 18:261-77.

1885. A contribution to the herpetology of Mexico. Ibid., 22:379-404.

DAVIS, W. B., and J. R. DIXON

1957. Notes on Mexican amphibians, with description of a new Microbatrachylus. Herpetologica, 13:145-47.

1965. Amphibians of the Chilpancingo Region, Mexico. Ibid., 20:225-33.

DIAZ DE LEON, J.

1904. Indice de los Batracios que se enquentran en la Republica Mexicana. Imprenta de Ricardo Rodriquez Romo. Aguascalientes. 40 pp.

DIXON, J. R.

1957. Geographic variation and distribution of the genus Tomodactylus in Mexico. Texas J. Sci., 9:379-409.

DIXON, J. R., and R. G. WEBB

1966. A new Syrrhophus from Mexico (Amphibia: Leptodactylidae). Cont. Sc., Los Angeles Co. Mus., 102:1-5.

DUELLMAN, W. E.

1958. A review of the frogs of the genus Syrrhophus in western Mexico. Occ. Pap. Mus. Zool. Univ. Michigan, 594:1-15.

1960. A distributional study of the amphibians of the Isthmus of Tehuantepec, Mexico. Univ. Kansas Publs. Mus. Nat. Hist., 13:19-72.

FIRSCHEIN, I. L.

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

FOUQUETTE, M. J.

1960. Call structure in frogs of the family Leptodactylidae. Texas J. Sci., 12:201-15.

GADOW, H.

1905. The distribution of Mexican amphibians and reptiles. Proc. Zool. Soc. London, 1905, pt. 2:191-244.

GORHAM, S. W.

1966. Liste der rezenten Amphibien und Reptilien.... Das Tierreich. Lief, 85:1-222.

GUeNTHER, A. C. L. G.