34 BULLETIN 187, UNITED STATES NATIONAL MUSEUM 



Range. — Southeastern California, southern Arizona (except eastern 

 corner), western Sonora, and Baja California. 



Species. — Three forms, comprising two species, all occurring in 

 Mexico. 



KEY TO FORMS OF CHILOMENISCUS 



1. Black cross bands present on body cinctus 



No black cross bands 2 



2. Each dorsal scale, except in two outer rows, with a black dot at posterior 



edge ; ventrals average 109 in males, 117 in females ; caudals average 29 



in males, 27 in females stramineus stramineus 



Dorsal scales with several small, scattered dots, or a large blotch ; rarely 

 a dot on posterior edge of dorsal scales; ventrals average 120 in males, 

 130 in females ; caudals average 25 in males, 22 in females. 



stramineus esterensis 



CHILOMENISCUS CINCTUS Cope 



Chilomeniscus cinctus Cope, Proc. Acad. Nat. Sci. Philadelphia, vol. 13, 1861, 

 p. 303.— LiNSDAXB, Univ. California Publ. Zool., vol. 38, 1932, pp. 381-382.— 

 DiTMABS, Field book of North American snakes, 1939, p. 216, pi. 38. — Schmidt 

 and DA\as, Field book of snakes, 1941, pp. 204-205, fig. 66, pi. 22 (upper fig.). 



Chilomeniscus stramineus fasciatus Cope, Proc. U. S. Nat. Mus., vol. 14, 1892, 

 p. 595 (type locality, La Paz, Baja California; type, U.S.N.M. No. 12630). 



Chilomeniscus punctatissimus Van Dbnbtjegh and Slevin, Proc. California Acad. 

 Sci., ser. 4, vol. 11, 1921, p. 98 (type locality, Isla Partida, Espiritu Santo 

 Island, Baja California ; type. Calif. Acad. Sci. No. 49156) . 



Tl/pe. — Lost. 



Ti/pe locality. — Near Guaymas, Sonora. 



Bange. — Southeastern California, southern Arizona (except extreme 

 eastern corner), western Sonora, and Baja California to (but not in- 

 cluding) the Cape region (known from several localities in Baja Cali- 

 fornia, but only the tj'pe locality on mainland Mexico) . 



CHILOMENISCUS STRAMINEUS STRAMINEUS Cope 



Chilomeniscus stramineus Cope, Proc. Acad. Nat. Sci. Philadelphia, vol. 12, 1860, 



p. 339.— LiNSDALE, Copeia, 1936, No. 4, p. 232-234. 

 Chilomeniscus stramineus stramineus Hoard, Journ. Ent. Zool., vol. 31, 1939, 



pp. 45-46. 



Type.—U.S.'N.M. Nos. 4674 (2), 6495 (2); Acad. Nat. Sci. Phila. 

 No. 3405, five cotypes. 



Type locality. — Cape San Lucas, Baja California. 

 Range. — Cape region of Baja California. 



CHILOMENISCUS STRAMINEUS ESTERENSIS Hoard 



Chilomeniscus stramineus esterensis Hoard, Journ. Ent. Zool., vol. 31, 1939, 

 pp. 45-46, fig. 



Type.—L. M. Klauber Coll. (San Diego, Calif.) No. 30368, 

 Type locality. — Estero Salina, Baja California. 

 Range. — Known only from the type locality. 



