146 COLUBRID^. 



1. Xenodon colubrinus. 



Coluber rabdocephalus, part., Wied, Beitr.Nat. Bras. i. p. 351 (1825), 



and Ahbild. (1831). 

 Xenodon rhabdocephalus, part., Schleg. Phys. Serp. ii. p. 87 (1837) ; 



Dum. 8f Bibr. vii. p. 758 (1854) ; Jan. Arch. Zool. Anat. Phys. ii. 



1863, p. 317 ; Giinth. Biol. C.-Am., Peiit. p. 114 (1894). 

 colubrinus, Giinth. Cat. p. 55 (1858), and Ann. Sf Mag. N. H. 



(3) xn. 1863, p. 353, pi. v. tig. E, and Zool. Pec. 1865, p. 126. 

 severus, part., Ja7i, I. c. p. 317, and Icon. Gen. 19, pi. iii. fig. A 



(1866). 



berth oldi, Jan, II. cc. p. 318, pi. iv. fig. 2. 



angustirostris, Peters, Mon. Berl. Ac. 1864, p. 390, & 1873, 



p. 607. 



, sp., F. Midler-, Verh. nat. Ges. Basel, vi. 1878, p. 663. 



severus, var. angustirostris, Bocourt, Miss. Sc. Mex., Pept. 



p. 6.38, pi. xxxviii. fig. 3 (1886). 

 biprseocularis, Cope, Proc. Am. Philos. Soc. xxii. 1886, p. 103. 



Maxillary teeth 13-15 + 2. 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 prsefrontals ; 

 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 prse- and 

 two or three postoculars ; temporals 1 + 2 (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 angnlate 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 bifurcate 

 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. 2 (V. 151 ; C. 44). Para. E. Graham, Esq. |^P.]. 



(Type.) 

 6, f. 2 (V. 147, 146; Bahia. Dr. W ucherer [C], 



C. 47, 45). 



d. Yo-. (V. 142 ; C. 45). Bahia. Haslar Collection. 



e. $ "(V. 148 ; C. 43). Moyobamba, N.E. Mr. A. H. Roff [0.]. 



Peru. 



f. Yff. (V. 141; C. 40). Sarayacu, N.E. Peru. Mr. W. Davies [C.I; 

 ■^ ° ^ Messrs. Veitch [P.J. 



a-i. 2 (V. 153, 148 ; C. Medellin. 

 49, 45) & yg. (Y. 148 ; 

 C. 42). 



