150 COLUBRID.l. 



q. $ (V. 136 ; C. 39). Cayaria, N.E. Peru 



. Mr. W. Pavies {0.1 ; 

 M.-.srs. Witch [P.J. 



r. $ (V. 138; C. 36). Yurimaguas, N.E. Dr. Ilalmel [C.]. 



Peru. 

 s, t. $ (V. 144; C. 38) Guayaquil. Mr. Fraser [C.]. 



& yg. (V. 134 ; C. 37). 

 . $, skel. Demerara. Demerara Museum. 



6. Xenodon merremii. 



Ophis meiromii, Wagl. in Spiv, Serp. Drat. p. 47, pi. xvii. (1824). 

 Coluber rabdocephalus, part., Wied, Beitr. Nat. Bras. i. p. 361, and 



Abbild. (1825). 



P Xenodon ocellatus, Bofe, his, 1827, p. 641. 

 ? Xenodon aeneus, Boie, I. c. 

 Xeuodon rhabdoceplialus, part., Schleg. Phys. Serp. ii. p. 87 (1837) ; 



Dum. Sf Bibr. vii. p. 758, pi. Ixxvi. fig. 5 (1854) ; Gunth. Vat. 



p. 56 (1858); Jan, Arch. Zool. Anat. Phys. ii. 1803, p. 317, and Icon. 



Gtn. 13, pi. iv. fig. 1 (1860). 

 rhabdocephalus, Gunth. Ann. $ Mag. N. H. (3) xii. 1803, 



p. 353, pi. v. fig. B ; Hensel, Arch.f. Nat. 1868, p. 326. 



irregularie, Giinth. 1. c. p. 354, fig. D. 



severus, Boettg. Zeitschr.f. ges. Naturw. Iviii. 1885, p. 232. 



Maxillary teeth 6 or 7 + 2. Head short, much depressed ; body 

 more or less depressed, llostral twice as broad as deep, the portion 

 visible from above measuring one third to one half its distance from 

 the frontal ; internasals as long as broad or a little broader than 

 long, a little shorter than the praefrontals ; frontal longer than broad, 

 as long as or a little longer than its distance from the rostral, as 

 long as or a little longer than the parietals ; loreal deeper than long ; 

 one or two prse- aud two or three postoculars ; one or two small 

 suboculars sometimes present; temporals 1 + 2; seven (rarely 

 eight) upper labials, third and fourth (or third or fourth only) 

 entering the eye; five or six lower labials in contact with the 

 anterior chin-shields, which are larger than the posterior. Scales 

 in 19 rows. Ventrals not angulate laterally, 132-157; anal 

 divided (rarely entire) ; subcaudals 33-48. Pale brown above, with 

 broad brown, black-edged cross bands constricted or sometimes 

 even interrupted in the middle ; head with dark curved bands ; 

 these markings may disappear or be reduced to blackish cross bars 

 in old specimens ; belly yellowish, uniform or dotted with brown. 



Total length 1040 millim.; tail 130. 



Guianas, Brazil, Paraguay. 



a. Yg. (V. 146 ; C. 48). Demerara. Capt. E. Sabine [P.]. ) 



*. $ (V. 163; C. 36). Para. f 



(Types of X. irregularis.} 



c. Yg. (V. 142 ; C. 42). Pernambuco. J. P. G. Smith, Esq. [P.]. 



d. $ (V. 144: C. 37). Pernambuco. W. A. Forbes, Esq. [P.]. 



e. Yg. (V. 132; C. 44). Iguarasae, Pernam- G. A. Ramage, Esq. [C.]. 



buco. 



f. $ (V. 160; C. 35). Bahia. 



