CHECKLIST OF THE SNAKES OF MEXICO 73 



Subcaudals not over 60; pariefals not normally in contact with post- 

 oculars 3 



3. Nuchal spot covering 9 or 10 scale lengths ochrorhyncha janii 



Nuchal spot (or spots) covering 6 scale lengths or less. 



ochrorhynclia ochrorhyncha 



4. Scales In 19 rows; one preocular affinis 



Scales in 21 rows; two preoculars 5 



5. Ventrals 1G2, caudals 57, body spots 43 in type (male) dunklei 



Ventrals 164 to 174, caudals 35-56, body spots 52-54 torquata 



HYPSIGLENA AFFINIS Boulenger 



Hypsiglena affinis Boltlenger, Catalogue of the snakes in the British Museum, 

 vol. 2, 1S94, pp. 210-211, pi. 8, fig. 1.— Taylok, Univ. Kansas Sci. Bull., vol. 25, 

 1938 (1939), pp. 370-371, pi. 37, fig. 2. 



Type.— Brit. Mus. Nat. Hist. 

 Type locality. — Zacatecas and Jalisco. 



Banff e. — Western Zacatecas and Jalisco (definite records are only 

 from Magdalena, Jalisco, and Mezquital del Oro, Zacatecas). 



HYPSIGLENA DUNKLEI Taylor 



Hypsiglena torquata dunklei Taylor, Univ. Kansas Sci. Bull., vol. 25, 1938 (1939), 

 pp. 374-375, pi. 37, fig. 1. 



Type.— Mus. Comp. Zool. No. 42594. 



Type locality. — Hacienda La Clementina, near Forlon, Tamaulipas. 



Range. — Known only from the type locality. 



HYPSIGLENA OCHRORHYNCHA OCHRORHYNCHA Cope «> 



Hypsiglena ochrorhynchus Cope, Proc. Acad. Nat. Sci. Philadelphia, vol. 12, 1860, 

 pp. 246-247. 



Hypsiglena ochrorhynchus ochrorhynchus Stejneger and Babbour, A check list 

 of North American amphibians and reptiles, ed. 1, 1917, p. 93. — Van Den- 

 burgh, Occ. Pap. California Acad. Sci., vol. 10, 1922, pp. 780-783, pi. 85. 



Hypsiglena chloiophaea Cope, Proc. Acad. Nat. Sci. Philadelphia, 1860, p. 247 

 (tj'pe locality. Fort Buchanan, Ariz.; three cotypes, U.S.N.M. No. 5283, 

 Acad. Nat. Sci. Phila. Nos. 3537-8). 



Hypsiglena venusta Mocquard, Nouv. Arch. Mus. Hist. Nat. Paris, ser. 4, vol. 1, 

 1890, p. 327 (type locality, Santa Rosalia and San Ignacio, Baja California; 

 six cotypes, Mus. Hist. Nat. Paris). — Klaubeb, Copeia, No. 4, 1938, pp. 192- 

 193. 



Type.— v. ^.'^.M. No. 4676, Acad. Nat. Sci. Phila. Nos. 3748-9, Mus. 

 Comp. Zool. No. 9503, four cotypes. 



Type locality. — Cape San Lucas, Baja California. 



Range. — Southern Idaho and central Washington south through 

 Baja California, western Colorado, and central Texas, reaching south- 

 ern Sonora and southern Chihuahua and Coahuila (recorded from 

 several localities in the Mexican states of Baja California, Chihuahua, 

 Coahuila, Durango, Nuevo Leon, San Luis Potosi, and Sonora). 



**> We believe that a careful study of this widespread form will result in the definition of 

 teveral geographic races not now recognizable. 



