MEXICAN SNAKES AND CROCODILMNS — SMITH 501 



Dunkle, David Hosbrook, and Smith, Hobart Muib. 



1937. Notes on some Mexican ophidians. Occ. Pap. Mus. Zool. Univ. Michi- 

 gan, No. 303, 15 pp. 

 Dunn, EMMErr Reid. 



1919. Two new crotaline snakes from western Mexico. Proc. Biol. Soc. 



Washington, vol. 32, pp. 213-216. 



1920. A new Geophis from Mexico. Proc. Biol. Soc. Washington, vol. 33, pp. 



127-128. 

 1924. Amastridium, a neglected genus of snakes. Proc. U. S. Nat. Mus., vol. 

 05. art. 11, 3 pp. 

 Gaigk, Helen Thompson. 



1936. Some reptiles and amphibians from Yucatan and Campeche, Mexico. 



Carnegie Inst. Washington Publ. 457, pp. 2S9-304. 

 Gloyd, Howard Kay. 



1940. The rattlesnakes, genera Sistrurus and Crotalus: A study in zoo- 



geography and evolution. Chicago Acad. Sci. Spec. Publ. 4, viii+270 



pp., 10 tigs., 22 maps, 31 pis. 

 Gloyd, Howard Kay, and Smith, Hobart Muir. 



1942. Amphibians and reptiles from the Carmen Mountains, Coahuila. Bull. 



Chicago Acad. Sci., vol. 6, No. 13, pp. 231-235. 

 Grobman, Arnold Beahms. 



1941. A contribution to the knowledge of variation in Opheodrys vernalis 



(Harlan), with the description of a new subspecies. Mus. Zool. Univ. 

 Michigan Misc. Publ. 50, 38 pp., map, 2 figs. 

 Haetweg, Norman. 



1940. Description of Salvadora intermedia, new species, with remarks on the 

 graliamiae group. Copeia, 1940, pp. 256-259. 

 Haetweg, Norman, and Oliver, James Arthur. 



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. Mus. Zool. Univ. Michigan 

 Misc. Publ. 47, 31 pp. 

 Jan, Georg. 



1863. Elenco sistematico degli ofidi descritti e diseguati per l'iconografia gen- 

 erale, vii-f-143 pp. 

 Kennicott, Robert. 



1860. Descriptions of North American serpents in the museum of the Smith- 

 sonian Institution, Washington. Proc. Acad. Nat. Sci. Philadelphia, 

 1860, pp. 328-338. 

 Klauber, Laurence Monroe. 



1940. The worm snakes of the genus Leptotyphlops in the United States and 

 northern Mexico. Trans. San Diego Soc. Nat. Hist., vol. 9, pp. 87-162, 

 8 figs., 2 maps, 1 pi. 

 Olives, James Arthur. 



1937. Notes on a collection of amphibians and reptiles from the state of Colinia, 



Mexico. Occ. Pap. Mus. Zool. Univ. Michigan, No. 360, 30 pp., 1 

 fig, 1 pi. 



1942. A check list of the snakes of the genus Leptophis, with descriptions of 



new forms. Occ. Pap. Mus. Zool. Univ. Michigan, No. 462, 19 pp. 

 Obtenburger, Arthub Irving. 



1923. A note on the genera Coluber and MasticopJiis, and a description of a 

 new species of Masticophis. Occ. Pap. Mus. Zool. Univ. Michigan, 

 No. 139, 14 pp., 3 pis. 



