146 COLUBRID, 
1. Xenodon colubrinus. 
Coluber rabdocephalus, part., Wied, Beitr. Nat. Bras. i. p. 851 (1825), 
and Abbild. (1831). 
Xenodon rhabdocephalus, part., Schleg. Phys. Serp. ii. p. 87 (1837) ; 
Dum. § Bibr. vii. p. 758 (1854) ; Jan, Arch. Zool. Anat. Phys. ii. 
1863, p. 317; Giinth. Biol. C-Am., Rept. p. 114 (1894). - 
colubrinus, Giinth. Cat. p. 55 (1858), and Ann. & Mag. N. H. 
(8) xii. 1863, p. 353, pl. v. fig. E, and Zool. Rec. 1865, p. 126. 
severus, part., Jan, l.c. p. 317, and Icon, Gén. 19, pl. iii. fig. A 
(1866). 
bestholdl Jan, ll. ec. p. 318, pl. iv. fig. 2. 
angustirostris, Peters, Mon. Berl. Ac. 1864, p. 390, & 1873, 
. 607. 
i , sp., &. Miiller, Verh. nat. Ges. Basel, vi. 1878, p. 665. 
severus, var. angustirostris, Bocourt, Miss. Se. Mex., Rept, 
p. 638, pl. xxxviil. fig. 3 (1886). gG 
biprzeocularis, Cope, Proc. Am. Philos. Soc. xxii. 1886, p. 408: 
Maxillary teeth 13-1542. Head moderately depressed. Rostral 
shield once and a half to once and two thirds as broad as deep, the 
- portion visible from above measuring one fifth to one third its 
distance from the frontal; internasals as long as broad or a little 
broader than long, as long as or a little shorter than the preefrontals ; 
frontal as long as broad or a little longer, as long as its distance 
from the rostral, as long as or a little shorter than the parietals; 
loreal as long as deep or deeper than long ; one or two pre- and 
two or three postoculars; temporals 142 (rarely 2+2); eight 
upper labials (exceptionally seven), fourth and fifth (or third and 
fourth) entering the eye; four or five lower labials in contact with 
the anterior chin-shields, which are larger than the posterior. 
Scales in 19 rows (rarely 21). Ventrals not angulate laterally, 
131-153 ; anal entire; subcaudals 36-50. Pale brown above, with 
broad brown dark-edged cross bands constricted or interrupted in 
the middle ; a dark marking on the crown and nape, usually bifureate 
behind, separated from a dark band, extending from the eye to the 
angle of the mouth, by a pale oblique temporal] streak ; lower parts 
yellowish, more or less obscured by brown dots, or with dark cross 
bars in the young. 
Total length 1100 millim. ; tail 150. 
Central and Tropical South America. 
a. 9 (V.151; C. 44). —— Para. R. Graham, Bea 
; (Type.) 
b,c. Q (V. 147, 146; Bahia. Dr. Wucherer (0.4. 
C. 47, 45). 
ad. Yg. (V. 142; C. 45). Bahia. Haslar Collection. 
e. 9 (V. 148; C. 43). Moyobamba, N.E. Mr. A. H. Roff [C.]. 
Peru. 
f. Yg. (V. 141; C. 40). Sarayacu,N.E. Peru. Mr. .W. Davies Py 
: Messrs. Veitch | P. 
g-t. 2 (V.153, 148; C. Medellin. 
49, 45) & ye. (V. 148; 
C. 42). 
