CHECKLIST OF THE SNAKES OF MEXICO 153 



273 (type locality, Hacienda de Chitalon, Mazatenango, Guatemala; type 

 in Basle Mus. ) . 



Type. — Berlin Mus. 

 Type locality. — Unknown. 



Range. — Pacific slopes of Chiapas and Guatemala (known in Mex- 

 ico only from Finca Juarez, near Escuintla, and Chicliarras, Chiapas). 



Genus XENODON Boie 



Xenodon Boee, Isis, 1827, p. 540. 



Genotype. — Coluber severus Linnaeus. 



Range. — Central Mexico (coastal) southward to Argentina. 

 Species. — About seven or eight species are known, only one oc- 

 curring in Mexico. ''^ 



XENODON MEXICANUS Smith 



Xenodon angustirostris Tatlob and Smith {nee Peters), Univ. Kansas Sci. Bull., 



vol. 25, 1938 (1939), pp. 242-244, pi. 23, fig. 4. 

 Xenodon mexicanus Smith, Proc. Biol. Soc. Washington, vol. 53, 1940, pp. 57-59, 

 Xenodon rahdoceplialus mexicanus Schmidt, Publ. Field Mus. Nat. Hist., zool. 



ser., vol. 22, 1941, p. 501. 



ryjoe.— U.S.N.M. No. 108596. 



Type locality. — Piedras Negras, Guatemala. 



Range. — British Honduras and Peten, Guatemala, northward in the 

 foothills to central Veracruz ; on Pacific slopes from central Guerrero 

 presumably to El Salvador (known in Mexico from the states of 

 Chiapas, Guerrero, Tabasco, and Veracruz). 



Subfamily Natricinae Cope 



Natricinae Cope, Trans. Amer. Pliilos. Soc, vol. 18, 1895, pp. 200, 20(>-207. 

 Type. — Natrix Laurenti. 



Genus ADELOPHIS Duges 



Adelophis Dug^s, in Cope, Proc. Amer. Philos. Soc, vol. 18, 1879, pp. 265-266. 



Genotype.-^Adelophis copei Duges. 

 Range. — Jalisco, Guanajuato, and Morelos. 

 Species. — One. 



ADELOPHIS COPEI Doges 



Adelophis copei Dug:&s, Proc. Amer. Philos. Soc, vol. 18, 1879, pp. 265-266. — 

 BocouET, Mission scieutifique au Mexique et dans I'Amerique Centrale, Rupt., 



"<* Xenodon bertholdi Jan (Arch. Zool. Anat. Fis., vol. 2, 1863, pp. 316, 318-319) is said 

 to be from "Mexico," but this is a very different species. Tlie ventral count given is 153, 

 while northern (Mexico and Guatemala) specimens of X. meiicanus with reliable locality 

 data show a variation in ventral count from 124 to 136. It may be inferred either that two 

 species, mexicanus and bertholdi, occur in Mexico or that the locality data for the type 

 of the latter are erroneous. At the present the latter appears the more probable inference. 

 A specimen very much like the type of X bertholdi is known from Esparta, Costa Rica 

 CU.S.N.M. No. 27482). 



