84 COLUBRID. 
II. Scales in 15 rows, vertebral row strongly enlarged. 
3. lentiferus, p. 86. 
III. Scales in 17 rows, vertebral row not or but very slightly 
enlarged 
A, Anal divided. 
1. Frontal not twice as long as broad. 
Head twice or twice and a half as wide 
ene MOO eS cals oe hates 4. gemmistratus, p. 86. 
Neck extremely slender, not more than 
one third the width of the head .... 5. gracillimus, p. 87. 
2. Frontal more than twice as long as broad. 
6. inornatus, p. 88. 
B, Anal entire 52.262 0:60 secon ee 7. subequalis, p. 88. 
1. Himantodes cenchoa. 
Seba, Thes. ii. pl. xvi. figs. 2 & 3 (1735). 
Coluber cenchoa, Linn. S. N. i. p. 389 (1766); Daud. Rept. vi. 
p- 283 (1803). 
Bungarus cencoalt, Oppel, Ann. Mus. xvi. 1810, p. 392. 
Dipsas cenchoa, Wied, Beitr. Nat. Bras. i. p. 896 (1825) ; Giinth. 
Cat. p. 174 (1858), and Biol. C.-Am., Rept. p. 175 (1895). 
8 a 
weigelii, Fitzing. N. Class. Rept. 826); Schleg. Phys. 
Serp. it p. 278, pl. xi. figs. 19 & 20 (1 cana 
Imantodes cenchoa, Dum. & Bibr. vii. p. 1065 (1854 
Himantodes cenchoa, Cope, Proc. Ac. Philad. 1s¢i, p- 296, and 
Amer. Nat. 1894, p. 618. 
leucomelas, Cope, Ul. ce, 
— anisolepis, Cope, Amer, Nat. 1894, p. 618. 
Rostral small, broader than deep, scarcely visible from above ; 
internasals much shorter than the prefrontals; frontal once and 
one fourth to once and a half as long as broad, as long as or a little 
longer than its distance from the end of the snout, shorter than the 
arietals ; loreal as'long as deep or deeper than long, rarely a little 
onger than deep; one or two (rarely three) preoculars, frequently 
a small upper and a large lower; two (rarely three) postoculars ; 
temporals 1 or 242 or 3; eight upper labials, fourth and fifth or 
third, fourth, and fifth entering the eye ; four or five lower labials 
in contact with the anterior chin-shields, which are as long as or 
shorter than the posterior. Scales in 17 rows, vertebrals strongly 
enlarged, the largest broader than long. Ventrals 220-267; anal 
divided ; subcaudals 122-175. Pale brown or greyish above; 
head with dark brown spots or bands which may be separated by 
narrow light lines; body with 26 to 58 dark brown or reddish- 
brown spots or cross-bands edged with darker and lighter, narrowed 
on the sides, where they may break up into spots; lower parts 
whitish, dotted or powdered with brown, with or without a dark 
streak along the middle of the belly. 
Total length 1100 millim.; tail 340. 
Mexico, Central America, Tropical South America. 
