151. HIMANTODES. 83 



Dipsas macrorhina, Schleo. Phys. Serp. ii. p. 289, pi. xi. flo-s. 31 & 3 



(1887). 

 Rhinobotkryum lentiginosum, Dum. ^ Bibr. vii. p. 1061 (1854) ; 



Jan, Icon. G4n. 38, pi. i. fig-. 3 (1871). 



Snout broad, truncate. Eostral 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 praeocular, not extending to the upper 

 surface of the head ; two postoculaxs ; temporals 2+2 ; eight to 

 ten upper labials, fourth and fifth or fifth . and sixth entering the 

 «ye ; 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. d (Sc. 19 ; V. 257 ; 0. 114). Yuiimaguas, N.E. Peru. 

 i. d (Sc. 19 ; V. 275; C. 117). ? 



151. HIMANTODES. ^- 



Bungarus, part., Oppel, Ann. Mus. xvi. 1810, p. 391. 



Dipsas, part., Fitdng. N. Class. Rept. p. 29 (1826) ; Wagl. Syst. 



Amph. p. 180 (1830) ; ScMeff. Phys. Serp. ii. p. 257 (1837) ; 



Gilnth. Cat. Col. Sn. p. 169 (1858). 

 Imantodes, Dum. ^ Bibr. M&m. Ac. Sc. xxiii. 1853, p. 507, and Erp. 



Gen. vii. p. 1064 (1854). 

 Himantodes, Cope, Proc. Ac. PMlad. 1860, p. 264 ; Jan, Elenoo aist. 



Ofid. p. 102 (1863). 



Maxillary teeth equal, 12 to 18, followed, after an interspace, by 

 & 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 



TOWS. 



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. cendhoa, p. 84. 



Vertebral scales, none broader than long 2. eleaans, p. 85. 



g2 



