146 f.>l.|-UKIH.K. 



1. Xenodon colubrinus. 



Coluber rabdocephalus, part., Wied, Beitr.Nat. Bras. i. p. 361 (1825), 



and Abbild. (1831). 

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



l>mn 8f ibr. vii. p. 758 (1854) ; Jan, Arch. Zool. Anat. Phys. ii. 



1803, p. 317 ; Giinth. liiol. C.-Am., Kept. p. 114 (1894). 



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



. fig. E, and Zool. Rec. 1865, p. ; 

 severus, part., Jan, 1. c. p. 317, and Icon. Gen. 19, pi. iii. fig. A 



(3) xn. 1803, p. 853, pi. v. tig. E, and Zool. Rec. 1865, p. 120. 



(1866). 



bertholdi, Jim, U. cc. p. 318, pi. iv. fig. 2. 



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



p. 607. 



, sp., F. Miiller, Verh. not. Ges. Basel, vi. 1878, p. 663. 



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



p. 638, 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 prefrontals ; 

 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 pne- 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 angulate laterally, 

 131-153 ; anal entire ; eubcaudals 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. $ (V. 151 ; C. 44). Para. R. Graham, Esq. [P.]. 



(Tvpe.) 



ft, c. $ (V. 147, 146; Bahia. Dr. Wucherer[C.]. 



C. 47, 45). 



d. Yg. (V. 142 ; C. 45). Bahia. Haalar Collection. 



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



Peru. 



/. Yg. (V. 141 ; C. 40). Sarayacu, N.E. Peru. Mr. W. Davies [0.1; 



Messrs. Veitch [P.J. 

 g-i. $ (V. 153, 148 ; 0. Medellin. 

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

 C. 42). 





