CHECKLIST OF THE SNAKES OF MEXICO 149 



•TRIMORPHODON VANDENBURGHI Klauber ™ 



Trimorphodon vandenMrghi Klatjbeb, Bull. Zool. Soc. San Diego, No. 1, 1924, 

 p. 17, fig. 3; Trans. San Diego Soc. Nat. Hist, vol. 5, 1928, pp. 187-190, 

 pi. 23 ; vol. 9, 1940, p. IGO, pi. 7, fig. 1. 



Ti/pe.—CsLlit Acad. Sci. No. 58192. 



Type locality. — Wildwood Ranch (elev. 1,520 feet), 5 miles south- 

 west of Ramona, San Diego County, Calif. 



Range. — "Coastal and desert southern California from Los Angeles 

 County and the Argus Mountains, Inyo County, south to the Mexican 

 border." 



TRIMORPHODON VILKINSONII Cope 



Trimorphodon vilkinsonii Cope, Proe. Amer. Philos. Soc, vol. 23, 1886, pp. 285- 

 286.— Taylor, Univ. Kansas Sci. Bull., vol. 25, 1938 (1939), pp. 361-3G3, 

 fig. 1, pi. 38.— Smith, Proc. U. S. Nat. Mus., vol. 91, 1941, p. 167, map fig. 38. 



Type.— V.S.N. M. No. 14268. 

 Type locality. — Chihuahua. 



Range. — Chihuahua to extreme western Texas (recorded in Mex- 

 ico only from "Chihuahua") . 



Genus TROPIDODIPSAS Gunther " 



Tropidodipsas GiJNTHER, Catalogue of the snakes in the British Museum, 1858, 



pp. 180-181. 

 Oaledon Jan, Iconographie gen^rale des ophidians, livr. 36, 1870, pi. 5, fig. 1 (type, 



Oaledon annularis Jan). 

 Tropidogeophis MtiixER, Verh. Naturf. Ges. Basel, vol. 6, 1878, pp. 409-411 (type, 



Geophis annulatus Petex's). 

 Dipeltophis Cope, U. S. Nat. Mus. Bull. 32, 1887, p. 58 (type, Leptognatlius 



albocinctus Fischer). 



Genotype. — Tropidodipsas fascidta Giinther. 



Range. — Colima (Sinaloa?) and central Veracruz southward on 

 both coasts to South America. 



Species. — Eleven species are recognized in the genus at present; 

 eight occur in Mexico.^- 



KEY TO MEXICAN FORMS OF TROPIDODIPSAS 



1. Dorsal scales in 15 rows 2 



Dorsal scales in 17 rows 3 



2. Belly mostly black, light only where light rings cross belly ; dorsal scales 



smooth throughout length of body occidentalis 



Belly mostly light ; dorsal scales feebly keeled at least posteriorly philippii 



3. Dark bands on body very numerous, distinct, 40 or more; dorsal keels 



relatively prominent fischeri 



'» "Although not yet collpcted in northern Lower California, it unquestionably occurs 

 there, for at several places it has been observed within a mile or so of the border" 

 (Klauber, loc. cit., 1940, p. 1G9). 



'1 See footnote for Dipsas, p. 49. 



'^ See Species Inquirendae, p. 200. 



