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Kellogg, Remington. 



1932. Mexican tailless amphibians in the United States National Museum. 

 U. S. Nat. Mus. Bull. 160, 223 pp., 24 figs., 1 pi. 



Owen, Richard. 



1844. Chai-acters of a new species of axolotl. Ann. Mag. Nat. Hist., ser. 1, 

 vol. 14, p. 23, 1 fig. 



Smith, H. M. 



1939. The Mexican and Central American lizards of the genus Scelopoms. 



Publ. Field Mus. Nat. Hist., zool. ser., vol. 26, 395 pp., 31 pis., 59 figs. 

 1942. The synonymy of the garter snakes (Thamnophis) , with notes on 



Mexican and Central American species. Zoologica, vol. 27, pp. 



97-123. 



1947. Notes on Mexican amphibians and reptiles. Journ. Washington Acad. 



Sci., vol. 37, pp. 408-412. 



Smith, H. M., and Taylok, E. H. 



1945. An annotated checklist and key to the snakes of Mexico. U. S. Nat. 

 Mus. Bull. 187, 239 pp. 



1948. An annotated checklist and key to the Amphibia of Mexico. U. S. 



Nat. Mus. Bull. 194, 118 pp. 



Stttart, L. C. 



1948. The amphibians and reptiles of Alta Verapaz, Guatemala. Misc. 

 Publ. Mus. Zool., Univ. Michigan, No. 69, pp. 5-109, 10 figs. 



Taylor, E. H. 



1939. New species of Mexican tailless Amphibia. Univ. Kansas Sci. Bull., 

 vol. 25, 1938, pp. 385-405, 2 figs., 3 pis. 



1941. Two new ambystomid salamanders from Chihuahua. Copeia, vol. 



3, pp. 143-146, 2 figs. 



1942. Tadpoles of Mexican Anura. Univ. Kansas Sci. Bull., vol. 28, pt. 1, 



pp. 37-55, 3 pis. 



Weight, A. H. 



1929. Synopsis and description of North American tadpoles. Proc. U. S. 

 Nat. Mus., vol. 74, art. 11, 70 pp., 9 pis. 



U. S. GOVERNMENT PRINTING OFFICE: 1951 



