150 COITTBEID^. 



q. ? (V. 136 ; C. 39). Oayaria, N.E. Peru. Mr. W. Pavies [C] ; 



Messrs. Veitch [P.]. 

 r. 5 (V. 1.88; C. 35). Yiirimaguas, N.E. Dr. Hahnel [C.]. 



Peru, 

 s, t. 5 (V. 144 ; 0. 38) Guayaquil. Mr. Eraser [C.]. 



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

 u. 5 , skel. Demerara. Demerara Museum. 



6. Xenodon merremii. 



Ophis merremii, Wagl. in Spix, Serp. Bras. p. 47, pi. xvii. (1824). 

 Coluljer rabdocephalus, part., Wied, Beitr. Nat. Bras, i, p. 351, and 



Abbild. (1825). 

 ? Xenodon ocellatua, Boie, Isis, 1827, p. 541. 

 ? Xenodon seneus, Boie, I. c. , 



Xenodon rhatdoceplialus, part., Sckleg. Phys. Serp. ii. p. 87 (1837) ; 



Bum. 8r Bibr. vii. p. 758, pi. Ixxvi. fig. 5 (1854) ; Ounth. Cat. 



p. 56 (1858) ; Jan, Arch. Zool. Anat. Phys. ii. 1863, p. 317, and Icon. 



G&n. 13, pi. iv. fig. 1 (1866). 

 ■ rhabdocephaliis, Oiinth. Ann. Sf Mag. N. H. (3) xii. 1863, 



p. 353, pi. T. fig. B ; Hensel, Areh.f. Nat. 1868, p. 325. 



irregularis, GiXnth. I. c. p. 354, tig. 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. Eostral 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 ; bellv 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.]. ) 



b. $ (V. 153; 0.36). Para. f 



(Types of X. irregularis^ 



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



d. $ (V. 144 ; 0. 37). Pemambuco. W. A. Forbes, Esq. [P.]. 



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



buco. 

 /. 2 (V. 150 ; 0. 35). Bahia. 



