CHECKLIST OF THE SNAKES OF MEXICO 21 



11. Five pigmented dorsal scale rows ; usually 244 or more dorsal scales. 



hum.ilis slevini 

 Seven pigmented dorsal scale rows ; usually less than 244 dorsal scales. 



dugesii 



12. Five lightly pigmented dorsal scale rovps ; usually 285 or more dorsal 



scales humilis cahuilae 



Seven or more heavily pigmented dorsal scale rows ; usually less than 

 285 dorsal scales humilis humilis 



LEPTOTYPHLOPS BRESSONI Taylor 



Leptotyphlops dressoni Taylor, Copeia, 1939, No. 1, pp. 5-6, figs. 7, 8. 



Type.—E. H. Taylor-H. M. Smith Coll. No. 5247. 



Type locality. — Hacienda El Sabino, near Uruapan, Michoacan. 



Range. — Known definitely only from the type locality (records for 

 Las Aguilillas and La Huacana, Michoacan, probably are referable 

 to this species). 



LEPTOTYPHLOPS DUGESII (Boconrt) 



Catodon dugesii Booourt, Bull. Soc. Philom., ser. 7, vol. 4, 1881, p. 81. 

 Leptotyphlops humilis dugesii Klauber, Trans. San Diego Soc. Nat. Hist., vol. 



9, 1940, pp. 129-131, map 2. 

 Leptotyphlops dugesii Taylor, Univ. Kansas Sci. Bull., vol. 26, 1939 (1940), 



p. 538, fig. 5 (head scales). 



Type. — Mus. Hist. Nat. Paris, two cotypes. 



Type locality. — Colima. 



Range. — Southern Sinaloa to Colima and perhaps eastward to 

 Guanajuato (recorded from Colima; Talpa, Jalisco; Mazatlan and 

 Presidio, Sinaloa; and doubtfully from G^aan/ijuato) . 



LEPTOTYPHLOPS DULCIS (Baird and Girard) 



Rena dulcis Baird and Giraed, Catalogue of North American reptiles, 1853, pp. 



142-143. 

 Leptotyphlops didcis Stejnegeb, Proc. U. S. Nat. Mus., vol. 14, 1891, p. 501. — 



Taylor, Copeia, 1939, No. 1, p. 4, figs. 1, 2 (head scales). 

 Leptotyphlops dulcis dulcis Klaxiber, Trans. San Diego Soc. Nat. Hist., vol. 9, 



1940, pp. 108-112, map 1." 



Type.—V.S.'N.M. No. 7296. 



Type locality. — Between San Pedro and Comanche Springs, Tex. 



Range. — Central Oklahoma and the Panhandle, south through cen- 

 tral Texas, Tamaulipas, and Nuevo Leon to northern Hidalgo (re- 

 corded in Mexico from Monterrey and Ojo de Agua, Nuevo Leon; 

 Matamoros and Bagdad, Tain/i^dipas] and Jacala, Hidalgo). 



" It appears to us that the evidence produced in this paper indicates that myopicus is 

 not a race of dulcis. 



