1943. Turtles and the origin of the fauna of Latin America. Amer. Jour. Sci., 24:413-429. 1965. The geography of evolution. Chilton Books Publishers. Philadelphia, pp. 1-349. July. SMITH, H. M. and E. H. TAYLOR 1948. An annotated checklist and key to the amphibians of México. Bull. U.S. Natl. Mus., 194:1-118. STARRETT, P. 1960. Description of tadpoles of Middle American frogs. Misc. Publ. Mus. Zool., Univ. Michigan, 110:1-37, pl. 1. 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, 29:1-56, pls. 1-4. October 1. 1948. The amphibians and reptiles of Alta Verapaz, Guatemala. Misc. Publ. Mus. Zool., Univ. Michigan, 69:1-109. June 12. 1950. A geographic study of the herpetofauna of Alta Verapaz, Guatemala. Contr. Lab. Vert. Biol., Univ. Michigan, 45:1-77, pls. 1-9. May. TAYLOR, E. H. 1938. Frogs of the _Hyla eximia_ group, with description of two new species. Univ. Kansas Sci. Bull., 25:421-445. June 1. 1952. The frogs and toads of Costa Rica. Univ. Kansas Sci. Bull., 35:577-942. July 1. 1958. Additions to the known herpetological fauna of Costa Rica, with comments on other species. No. III. Univ. Kansas Sci. Bull., 34:3-40. November 18. VIVO ESCOTO, J. A. 1964. Weather and climate of México and Central America. _In_ R. Wauchope and R. C. West (Eds.), Handbook of Middle American Indians. Vol. 1, Univ. Texas Press, Austin, 570 pp. _Transmitted February 7, 1969._