CHECKLIST OF THE SNAKES OF MEXICO 27 



on Miiller's 1878 description ; type and type locality identical with those of 

 V. continentalis Muller). 



Type. — Basel Mus. 



Type locality. — "Retaluleu," southwestern Guatemala. 



Range. — Pacific slopes of southern Chiapas and Guatemala 

 (recorded in Mexico only from Finca La Joya, near Tapachula, 

 Chiapas). 



Family PYTHONIDAE Cope 



Pythonidae Cope, Proc. Acad. Nat. Sci. Philadelphia, vol. 16, 1864, p. 230. 

 Type. — Python Daudin. 



Genus LOXOCEMUS Cope 



Loxocemus Cope, Proc. Acad. Nat. Sci. Philadelphia, vol. 13, 1861, pp. 76-77. 



Genotype. — Loxocemus hicolor Cope. 



Range. — The Pacific coast from Colima southward to Costa Rica. 



Species. — Two, both occurring in Mexico. 



KEY TO SPECIES OF LOXOCEMUS 



1. Supralabials white, this area sharply defined from dorsal color ; ventral 



surface of head white ; belly mostly white, little stippled bicolor 



Supralabials practically as dark as top of head ; ventral surface of head 

 heavily stippled; belly pigmented sumichrasti 



LOXOCEMUS BICOLOR Cope 



Loxocemus bicolor Cope, Proc. Acad. Nat. Sci. Philadelphia, vol. 13, 1861, p. 77. — 

 Taylor, Univ. Kansas Sci. Bull., vol. 26, 1939 (1940), pp. 445-447, fig. 1 (head 

 scales). 



IPlastoseryx bronni Jan, Arch. Naturg., vol. 28, 1862, pp. 242, 244-248 (type 

 locality, America ; type in Heidelberg Mus. ) . 



Type.— U.S.^.M. No. 4948, missing. 



Type locality. — La Union, El Salvador. 



Range. — Northern central Guerrero and Morelos southward to Costa 

 Rica, on the Pacific coast (known in Mexico from Agua Bendita, 

 Guerrero., Puente de Ixtla, Morelos., Tehuantepec, Oaxaca^ and near 

 Escuintla, Chiapas). 



LOXOCEMUS SUMICHRASTI Bocourt 



Loxocemus sumichrasti Boooubt, Ann. Sci. Nat., ser. 6, vol. 4, 1876, art. 7, p. 1. — 

 Tatlob, Univ. Kansas Sci. Bull., vol. 26, 1939 (1940), pp. 447, 448, fig. 2 (head 

 scales). 



Loxocemus bicolor (nee Cope) Ditmars, Snakes of the world, 1931, pi. 1. 



Type. — Mus. Hist. Nat. Paris. 

 Type locality. — Tehuantepec. 



