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1953. The savanna vegetation of northern tropical America. Ecol. Mono., vol. 23 (2):149-215.

Boulenger, G. A.

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Burt, C. E.

1931. A study of the teiid lizards of the genus Cnemidophorus with special reference to their phylogenetic relationships. Bull. U. S. Nat. Mus., No. 154, pp. viii + 286.

Contreras A., A.

1942. Mapa de las provincias climatologias de la Republica Mexicana. MÉxico, D. F., DirecciÓn de GeografÍa, MeterologÍa e HidrologÍa, pp. i-xxviii, tables 1-54, 2 maps.

Cooke, C. W.

1945. Geology of Florida. Florida Geol. Surv., Geol. Bull., No. 29:1-339.

Dorf, E.

1959. Climatic changes of the past and present. Contrib. Mus. Paleo. Univ. Michigan, vol. 13 (8):181-210.

Duellman, W. E.

1956. The frogs of the hylid genus Phrynohyas Fitzinger, 1843. Miscl. Publ. Mus. Zool. Univ. Michigan, No. 96:1-47, pls. 1-6.

1958a. A monographic study of the colubrid snake genus Leptodeira. Bull. Amer. Mus. Nat. Hist., vol. 114:1-152, pls. 1-31.

1958b. A preliminary analysis of the herpetofauna of Colima, Mexico. Occas. Papers Mus. Zool. Univ. Michigan, No. 589:1-22.

1958c. A review of the frogs of the genus Syrrhophus in western Mexico. Occas. Papers Mus. Zool. Univ. Michigan, No. 594:1-15, pls. 1-3.

Duellman, W. E., and Schwartz, A.

1958. Amphibians and reptiles of southern Florida. Bull. Florida State Mus., vol. 3 (5):181-324.

Dunn, E. R.

1942. The American caecilians. Bull. Mus. Comp. Zool., vol. 91 (6):439-540.

Durham, J. W., Arellano, A. R. V., and Peck, Jr., J. H.

1952. No Cenozoic Tehuantepec seaways. Bull. Geol. Soc. Amer., vol. 63:1245.

Firschein, I. L.

1950. A new toad from Mexico with a redefinition of the cristatus group. Copeia, 1950 (2):81-87, pl. 1.

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.

Goldman, E. A.

1951. Biological investigations in Mexico. Smithsonian Misc. Publ., vol. 115, xiii + 476 pp., pls. 1-71.

Goodnight, C. J., and Goodnight, M. L.

1956. Some observations in a tropical rain forest in Chiapas, Mexico. Ecology, vol. 37 (1):139-150.

Griscom, L.

1932. The distribution of bird-life in Guatemala. Bull. Amer. Mus. Nat. Hist., vol. 64:1-439.

1950. Distribution and origin of the birds of Mexico. Bull. Mus. Comp. Zool., vol. 103:341-382.

Hartweg, N., and Oliver, J. A.

1940. A contribution to the herpetology of the Isthmus of Tehuantepec. IV. An annotated list of the amphibians and reptiles collected on the Pacific slope during the summer of 1936. Misc. Publ. Mus. Zool. Univ. Michigan, No. 47:1-31.

Hubbell, T. H.

1954. Relationships and distribution of Mycotrupes. In The burrowing beetles of the genus Mycotrupes, Olson, A. L., Hubbell, T. H., and Howden, H. F. Misc. Publ. Mus. Zool. Univ. Michigan, No. 84:1-59, pls. 1-8.

Hutchinson, G. E., Patrick, R., and Deevey, E. S.

1956. Sediments of Lake Patzcuaro, MichoacÁn, Mexico. Bull. Geol. Soc. Amer., vol. 67:1491-1504.

Langebartel, D. A., and Smith, P. W.

1959. Noteworthy records of amphibians and reptiles from eastern Mexico. Herpetologica, vol. 15 (1):27-29.

Martin, P. S.

1958. Pleistocene ecology and biogeography of North America. Zoogeography. Amer. Assoc. Advanc. Sci., Publ. No. 51:375-420.

Martin, P. S., and Harrell, B. E.

1957. The Pleistocene history of temperate biotas in Mexico and eastern United States. Ecology, vol. 38:468-480.

Oliver, J. A.

1948. The relationships and zoogeography of the genus Thalerophis Oliver. Bull. Amer. Mus. Nat. Hist., vol. 92:157-280, pls. 16-19.

Olson, E. C., and McGrew, P. O.

1941. Mammalian fauna from the Pliocene of Honduras. Bull. Geol. Soc. Amer., vol. 52:1219-1244.

Ruthven, A. G.

1912. The amphibians and reptiles collected by the University of Michigan—Walker Expedition in southern Vera Cruz, Mexico. Zool. Jahrbuch, vol. 32 (4):295-332, pls. 6-11.

Schuchert, C.

1935. Historical geology of the Antillean-Caribbean region. New York, xxvi + 811 pp.

Sears, P. B., Foreman, F., and Clisby, K. H.

1955. Palynology in southern North America. Bull. Geol. Soc. Amer., vol. 66:471-530.

Shannon, F. A., and Werler, J.

1955. Notes on amphibians of the Los Tuxtlas Range of Veracruz, Mexico. Trans. Kansas Acad. Sci., vol. 58 (3):360-386.

Shreve, B.

1957. Reptiles and amphibians from the Selva Lacandona. In Biological Investigations in the Selva Lacandona, Chiapas, Mexico. Paynter, R. A. (editor). Bull. Mus. Comp. Zool., vol. 116 (4):193-298.

Smith, H. M.

1947. Notes on Mexican amphibians and reptiles. Jour. Washington Acad. Sci., vol. 37:408-412.

Smith, H. M., and Laufe, L. E.

1946. A summary of Mexican Lizards of the genus Ameiva. Univ. Kansas Sci. Bull., vol. 31 (2):7-73.

Smith, H. M., and Taylor, E. H.

1950. An annotated checklist and key to the reptiles of Mexico exclusive of the snakes. Bull. U. S. Natl. Mus., No. 199, v + 253 pp.

Stirton, R. A.

1954. Late Miocene mammals from Oaxaca, Mexico. Amer. Jour. Sci., No. 252:634-638.

Stuart, L. C.

1935. A contribution to a knowledge of the herpetology of a portion of the savanna region of central PetÉn, Guatemala. Misc. Publ. Mus. Zool. Univ. Michigan, No. 29:1-56, pls. 1-4.

1941. Studies of Neotropical Colubridae VIII. A revision of the genus Dryadophis Stuart, 1939. Misc. Publ. Mus. Zool. Univ. Michigan, No. 49:1-106, pls. 1-4.

1951. The herpetofauna of the Guatemalan Plateau, with special reference to its distribution on the southwestern highlands. Contrib. Lab. Vertebrate Biol., Univ. Michigan, No. 49:1-71, pls. 1-7.

1954. A description of a subhumid corridor across northern Central America, with comments on its herpetofaunal indicators. Contrib. Lab. Vertebrate Biol., Univ. Michigan, No. 65:1-26, pls. 1-6.

1958. A study of the herpetofauna of the Uaxactun-Tikal area of northern El PetÉn, Guatemala. Contrib. Lab. Vertebrate Biol., Univ. Michigan, No. 75:1-30.

Taylor, E. H.

1940. New species of Mexican Anura. Univ. Kansas Sci. Bull., vol. 26 (11):385-405.

1941. New amphibians from the Hobart M. Smith Mexican collections. Univ. Kansas Sci. Bull., vol. 27 (8):141-167.

1942. The frog genus Diaglena with a description of a new species. Univ. Kansas Sci. Bull., vol. 28 (4):57-65.

1943a. A new Hylella from Mexico. Proc. Biol. Soc. Washington, vol. 56:49-52.

1943b. Herpetological novelties from Mexico. Univ. Kansas Sci. Bull., vol. 29 (8):343-361.

Taylor, E. H., and Smith, H. M.

1945. Summary of the collections of amphibians made in Mexico under the Walter Rathbone Bacon Traveling Scholarship. Proc. U. S. Natl. Mus., vol. 95:521-613, pls. 18-32.

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1947. Recent changes in sedimentation in the Gulf of Mexico. Science, vol. 106:460-461.

Weyl, R.

1955. Vestigios de una glaciacion del Pleistoceno en la Cordillera de Talamanca, Costa Rica, A. C. Informe Trimestral, Inst. Geog. de Costa Rica, pp. 9-32.

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1956. Probable substages of glaciation on Ixtaccihuatl, Mexico. Jour. Geol., vol. 64:289-295.

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1939. Arboles y arbustos del Istmos de Tehuantepec, Mexico. Lilloa., vol. 4:137-171.

Transmitted May 23, 1960.