151. HIMANTODES, 83 
Dipsas macrorhina, Schleg. Phys. Serp. ii. p. 289, pl. xi. figs. 31.& 3 
(1837). 
Rhinobothryum lentiginosum, Dum. § Bibr. vii. p. 1061 (1854) ; 
Jan, Icon. Gén. 38, pl. i. fig. 3 (1871). 
Snout broad, truncate. Rostral very large, as deep as broad, 
separating the internasals, the portion visible from above as long as 
its distance from the frontal; frontal as long as broad, shorter than 
its distance from the end of the snout, shorter than the parietals ; 
loreal deeper than long; one preocular, not extending to the upper 
surface of the head; two postoculars; temporals 242; eight to 
ten upper labials, fourth and fifth or fifth and sixth entering the 
eye; four or five lower labials in contact with the anterior chin- 
shields ; posterior chin-shields narrower and separated from each 
other by scales. Scales rather strongly keeled on the back, smooth 
on the sides, in 19 or 21 rows. Ventrals 245-278; anal divided ; 
subcaudals 114-120. Body with black annuli separated by 
narrower whitish annuli which are spotted with black in the 
middle on the back; head-shields black, edged with whitish. 
Total length 1380 millim. ; tail 300. 
Colombia, Guianas, Eastern Peru. 
a. 3 (Se. 19; V. 257; OC. 114). Yurimaguas, N.E. Peru. 
&. 3 (Se. 19; V. 275; C.117). —-P 
151. HIMANTODES. 
Bungarus, part., Oppel, Ann. Mus. xvi. 1810, p. 391. 
Dipsas, part., Fitzng. N. Class. Rept. p. 29 (1826); Wagl. Syst. 
Amph. p. 180 (1880); Schleg. Phys. Serp. ii. p. 257 (1837); 
Giinth. Cat. Col. Sn. p. 169 (1858). 
Imantodes, Dum. §& Bibr. Mém. Ae. Se. xxiii. 1853, p. 507, and Erp. 
Gén. vil. p. 1064 (1854). 
Himantodes, Cope, Proc. Ac. Philad. 1860, p. 264; Jan, Elenco sist. 
Ofid. p. 102 (1863), 
Maxillary teeth equal, 12 to 18, followed, after an interspace, by 
a pair of enlarged grooved teeth situated just behind the vertical of 
the posterior border of the eye; anterior mandibular teeth longest. 
Head small, very distinct from neck ; eye very large, with vertically 
elliptic pupil. Body very slender, strongly compressed; scales 
narrow, smooth, with apical pits, in 15 or 17 rows, vertebral row 
enlarged or not; ventrals rounded. Tail long; subcaudals in two 
rows. 
Mexico, Central America, Tropical South America. 
Synopsis of the Species. 
I. Scales in 17 rows, vertebral row strongly enlarged. 
Vertebral scales, on the thickest part of 
the body, broader than long ........ 1. cenchoa, p. 84. 
Vertebral scales, none broader than long 2. elegans, p. 85, 
G2 
