~) 
150 COLUBRID. 
q. 2 (V. 136; C. 39). Cayaria, N.E. Peru. Mr. W. Davies C.); 
Messrs. Veitch [P. }. 
7.1 2 (V 5138; ©. 35). Yurimaguas, N.E. Dr. Hahnel [C.]. 
Peru. 
8s, & 9 (V. 144; C. 38) Guayaquil. Mr. Fraser [C.]. 
& yg. (V. 184; C. 37). 
u. 2, skel. Demerara. Demerara Museum. 
6. Xenodon merremii. 
Ophis merremii, Wagl. in Spix, Serp. Bras. p. 47, pl. xvii. (1824). 
Coluber rabdocephalus, part., Wied, Beitr. Nat. Bras. i. p. 351, and 
Ablitd. (1825). 
? Xenodon ocellatus, Bote, Ists, 1827, p. 541. 
? Xenodon eneus, Bore, J. c. 
Xenodon rhabdocephalus, part., Schleg. Phys. Serp, ii. p. 87 (1837) ; 
Dum. §& Bibr. vii. p. 758, pl. Ixxvi. fig. 5 (1854) ; Giinth. Cat. 
p- 56 (1858); Jan, Arch. Zool. Anat. Phys. i. 1863, p. 817, and Icon. 
Gén. 1p, pl. iv. fig. 1 (1866). 
rhabdocephalus, Giinth. Ann. §& Mag. N. H. (8) xii. 1868, 
p- 353, pl. v. fig. B; Hensel, Arch. f. Nat. 1868, p. 3265. 
irregularis, Giinth. l. c. p. 354, tig. D. 
severus, Boettg. Zeitschr. f. ges. Natwrw. lviii. 1885, p. 282. 
Maxillary teeth 6 or 7+2. Head short, much depressed ; body 
more or less depressed. Rostral 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 prefrontals ; 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 pre- aud two or three postoculars; one or two small 
suboculars sometimes present; temporals 142; 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.]. 
b. 9 (V. 158; C. 86). Para. 
Z (Types of X. zrregularis.) 
. Yg. (V. 142; C. 42), Pernambuco. J.P..G. Smith, Esq. [P.]. 
¢ / 
d. 9 (V. 144; C. 37). Pernambuco. W. A. Forbes, Esq. [P.]. 
e. Yg. (V. 182; C. 44). es Pernam- G, A. Ramage, Esq. [C.]. 
uco, 
7; 2 (V..150; C..35); Bahia. ' 
