68 COLUBRID.E. 



Pituoplris melanoleucus, VATS, catenifer and vertebralis, Jan, Icon. 

 Gin. 22, pi. i. figs. 1 & 3 (1867). 



reticulatus, Bocourt, I. c. pi. xlvii. fig. 3. 



cateniler deserticola, Ste/ncyer, I. c. 



Snout projecting ; rostral as broad as deep or slightly deeper, the 

 portion visible from above measuring one half its distance from the 

 frontal : intcruasals much shorter than the prsefrontals, which are 

 usually broken up into four shields ; frontal once and one fourth to 

 once and a half as long as broad, as long as its distance from the 

 rostral or the end of the snout, as long as the parietals ; loreal 

 longer than deep ; one prseocular, usually with a subocular below it ; 

 two or three postoculars and one or two suboculars ; temporals 3 or 

 4 + 4 or 5; eight upper labials, fourth usually entering the eye; 

 four or five lower labials in contact with the anterior chin-shields, 

 which are longer than the posterior. Scales in 29 to 35 rows, 

 dorsals more or less strongly keeled. Ventrals 204-245'; anal 

 entire ; subcaudals 66-72. Yellowish or pale brown above ; a 

 dorsal series of large dark brown or black spots ; sides with small 

 dark spots ; young with a dark band across the forehead, from eye 

 to eye, an oblique streak behind and another below the eye ; lower 

 parts yellowish, uniform or with brown blotches. 



Total length 1140 millim. ; tail 190. 



United States west of the Rocky Mountains ; Western Mexico. 



A. Fourth labial entering the eye. 



a. $ (Sc. 31; V. 218; Monterey, California. J. IL Gurney, Esq. 

 C. 66). [P.]. 



b. Yg. (Sc. 31 ; V. 204 ; San Francisco. Christiania Museum. 

 C. 68). 



c. d" (Sc. 29; V. 212; California. Smithsonian Instit. 

 C.70). [P.]. 



d. rf (Sc. 33; V. 218; California. 

 C. 70). 



e. c? (Sc. 31 ; V. 241 ; Great Salt Lake. Christiania Museum. 

 C. 70). 



f. <J (Sc. 29; V. 223; W.Mexico. Haslar Coll. 

 C. 70). 



g. Yg. (Sc. 29; V. 209; ? 



C. 71). 



B. Eye separated from the labials by a series of suboculars. 



A. c? (Sc. 33 ; V. 219 ; San Diego, California. Christiania Museum. 

 C.?). 



45. Coluber melanoleucus. 



Coluber melanoleucus, Dcntd. Kept. vi. p. 409 (1803); JIarl. Journ* 

 Ac. Philad. v. 1827, p. 359, and Med. Phys. Res. p. 122 (1836). 



sayi, Schleg. Phys. Serp. ii. p. 157 (1837). 



Pituophis melanoleucus, Holbr. N. Am. Herp. iv. p. 7, pi. i. (1842) ; 

 Batrd & Gir. Cat. N. Am. Eept. p. 65 (1853) ; Dum. $ Bibr. vii. 

 p. 233 '(1864) ; Giinth. Cat. p. 87 (1858) ; Baird, Hep. Ea-plor. 



