68 COLUBRID. 
Pituophis melanoleucus, vars. catenifer and vertebralis, Jan, Icon. 
Gén. 22, pl. i. figs. 1 & 3 (1867). 
reticulatus, Bocourt, lc. pl. xlvii. fig. 3. 
cateniler deserticola, Stejneger, 1. c. 
Snout projecting ; rostral as broad as deep or slightly deeper, the 
portion visible from above measuring one half its distance from the 
frontal ; internasals much shorter than the prefrontals, 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 preocular, usually with a subocular below it ; 
two or three postoculars and one or two suboculars ; temporals 3 or 
444 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. 2 (Se. 31; V. 218; Monterey, California. J. H. Gurney, Esq. 
PE 
C. 66). Ps). 
6b. Ye. (Se. 31; V. 204; San Francisco. Christiania Museum. 
Cc. oe 29; V. 212; California. Smithsonian Instit. 
d. S (86. 33; V. 218; California. g 
é. 3 “6 g.. 381; V. 241; Great Salt Lake. Christiania Museum, 
f. 3 (Se 29; V. 223; W. Mexico. Haslar Coll. 
9. Ye. ( 29; V. 209; -——? 
B. Eye separated from the labials by a series of suboculars, 
hk. 3 (Se. 33; V. 219; San Diego, California. Christiania Museum. 
C. ?). 
45. Coluber melanoleucus. 
Coluber melanoleucus, Daud. Rept. vi. p. 409 (1808); Harl. Journ. 
Ac, Philad. v. 1827, p. 359, and Med. Phys, Res, p. 122 (1835). 
aayi, Schleg. Phys. Serp. li. p. 157 (1837). 
Pituophis melanoleucus, Holbr. N. Am. Herp. iv. p. 7, pl. i. (1842) ; 
met Gir. Cat. N. Am. Rept. p. 65 (1853) ; ‘Dum. § Bibr. vii. 
. 233 (1854); Giinth. Cat. p. 87 (1858) ; Baird, Rep. Explor. 
