CHECKLIST OF THE SNAKES OF MEXICO 47 



11. In females, ventrals 224 to 239 ; in males, ventrals 204 to 22;"), and ditl'erence 



between ventral and caudal counts 139 or more 3 



In females, ventrals 191 to 209 ; in males, ventrals 182 to 209, and difference 

 between ventral and caudal counts 141 or less 4 



3. Neck ring present, two to four scales in width regalis laetus 



Neck ring absent or much reduced regalis reg'alis 



4. Neck ring obsolete, its edges indefinite ; ventrals heavily marked with com- 



plete or interrupted transverse black bars ; scale rows 15 posteriorly in 



both sexes amabilis anthonyi 



Neck ring usually distinct, sometimes interrupted medially; ventrals 

 dotted ; scale rows 13 posteriorly in all males and in four-tif ths of females. 



amabilis similis 



DIADOPHIS AMABILIS ANTHONYI Van Denburgh and Slevin 



DiadopJiifi anthonyi Van Denbukgh and Suevin, Proc. California Acad. Sci., ser. 



4, vol. 13, No. 1, 1923, p. 1. 

 Diadophis amahiUs anthomjl Blanchaed, Bull. Chicago Acad. Sci., vol. 7, No. 1, 



1942, pp. 47-48, map 1. 



Type.—Csilii. Acad. Sci. No. 56766. 



Type locality. — South Todos Santos Island, Baja California. 



Range. — The same. 



DIADOPHIS AMABILIS SIMILIS Blanchard 



Diadophis amabilis similis Blanchard, Occ. Pap. Mus. Zool. Univ. Michigan, No. 

 142, 1923, pp. 4-5, 8 ; Bull. Chicago Acad. Sci., vol. 7, No. 1, 1942, pp. 41-47, 

 figs. 10, 11, map 1. 



Type.— Mns. Zool. Univ. Mich. No. 57897. 



Type locality. — San Diego, Calif. 



Range. — From southwestern San Bernardino County south into the 

 San Pedro Martir range in Baja California, and San Martin Island,-^ 

 Baja California. 



DIADOPHIS DUGESII Villada 



Diadophis punctatus dougesii^* Villada, La Naturaleza, vol. 3, 1875, pp. 



22&-230, pi. 

 Diadophis rcijaUs dongcsii Taylor and Smith, Univ. Kansas Sci. Bull., vol. 25, 



1938 (1939), pp. 240-241, fig. 1.— Taylor, iUd., vol. 26, 1939 (1940), p. 455. 

 Diadophis dugesii Blanchard, Bull. Chicago Acad. Sci., vol. 7, No. 1, 1942, pp. 



51-54, fig. 1.3, map 2.— Smith, Proc. U. S. Nat. Mus., vol. 93, 1943, p. 417. 



Type. — ^Location unknown. 



Type locality. — Potreros de Balbuena, near Mexico (city), Distrito 

 Federal. 



Range. — The central plateau from central Veracruz (Mirador) west- 

 ward to Nayarit, northward to Guanajuato, south to Distrito Federal 



" Specimens from this island may be distinct (f/. Blanchard, op. cit., 1942, p. 46). 

 ^ The spelling is corrected in the list of errata at the end of the volume. 



