151. HIMANTODEs. 87 
lower labials in contact with the anterior chin-shields, which are 
as long as or a little longer than the posterior, Scales in 17 rows, 
vertebrals scarcely enlarged. Ventrals 223-250; anal divided; 
subcaudals 130-157. Pale brown above; head with dark brown 
spots or symmetrical markings; 35 to 50 dark brown spots or 
cross-bars on the body, lighter in the centre and sometimes edged 
with whitish, often connected by a narrow dark brown line on the 
middle of the back; lower parts whitish, dotted or powdered with 
brown. 
Total length 830 millim. ; tail 270. 
Mexico and Central America. 
A. 35 dorsal spots, broken up on the sides in the posterior half 
of the body. 
a. 2 (V. 228; C. ?). Yucatan. (Type of D. splendida.) 
B. 46 dorsal spots, all extending down to the ventrals. 
b, dg (V. 242; C. 155). Yucatan. 
C. 50 dorsal spots, broken up on the sides in the posterior fourth 
of the body. 
3 (V. 231; C. 180). Hacienda Santa Gertru- Dr. A. C. Buller [C.]. 
dio, Mexico. 
= 
5. Himantodes gracillimus. 
Dipsas gracillima, Giinth. Biol. C-Am., Rept. p. 177, pl. lvi. fig. B 
(1895). 
Neck extremely slender, not more than one third as wide as the 
head. Rostral small, broader than deep, scarcely visible from 
above; internasals much shorter than the prefrontals; frontal 
once and one third as long as broad, longer than its distance from 
the end of the snout, shorter than the parietals; loreal as long as 
deep or a little longer than deep; one preocular ; ; two post- 
oculars ; temporals 1+2; eight upper labials, fourth and fifth or 
third, fourth, and fifth entering the eye; five lower labials in contact 
with the anterior chin-shields, which are as long as or a little 
shorter than the posterior. Scales in 17 rows, vertebrals not 
enlarged. Ventrals 244-253; anal divided; subcaudals 145. 
Pale brownish above, with 42 to 72 darker spots edged with 
blackish; these spots being much larger than the! interspaces 
between them, the body appears brown with pale black-edged 
cross-bars ; whitish beneath, dotted or powdered with brown. 
Total length 1000 millim.; tail 300. 
Mexico. 
a, & (V. 244; C.?). &. Mexico. F. D. Gada Esq. 
eat [P.]._  (Type.) 
b. od (V. 253; C. 145). Tres Marias Ids., W. Hr, A. Forrer [0.1]. 
; Mexico. 
