68 COLTJBRID^. 



Pituopliis melanoleucus, vars. cateuifer atid vertebralis, Jan, Icon. 

 Gen. 22, pi. i. fig-s. 1 & 3 (1867). 



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



cateniler deserticola, Stejmyer, I. c. 



Snout projecting ; rostral as broad as deep or slight!)' deeper, the 

 portion visible from above measuring one half its distance from the 

 frontal ; internasals much shorter than the prscfrontals, which are 

 usually brolicn 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, usuall}' vpith 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 laljials 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. Yentrals 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 lUO. 



United States west of the Eocky Mountains ; Western Mexico. 



A. Fourth labial entering the eye. 



a. 2 (Sc. 31; V. 218; Monterey, California. J. H. Gurney, Esq. 

 C. 66). [P.]. 



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

 0. 68). 



c. (5' {Sc. 29; V. 212; California. Smithsonian Instit. 

 C.70). [P.]. 



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

 C. 70). 



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

 C. 70). 



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

 C. 70). 



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



C. 71). 



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



h. cJ (Sc. 33; V. 219; San Diego, California. Christiania Museum. 

 C.?). 



45. Coluber melanoleucus. 



Coluber melanoleucus, Dcivd. Sept. vi. p. 409 (1803); Harl. Journ. 



Ac. Philad. V. 1827, p. 359, and Med. Phys. Res. p. 122 (1835). 



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



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



jBavd Sr Gir. Cat. N. Am. Pept. p. 65 (1853) ; Dwn. ^f Pibr. vii. 



p. 233 (1854) ; Gilnth. Cat. p. 87 (1868) ; Paird, Pep. Explor. 



