16 COLUBRID. 
Drymobius percarinatus, Cope, Proc. Amer. Philos. Soc, xxxi. 1893, 
p. 344. 
Maxillary teeth 32 to 38, posterior moderately enlarged. Rostral 
broader than deep, visible from above ; internasals as long as or a 
little shorter than the prefrontals ; frontal once and a half to once 
and three fourths as long as broad, as long as its distance from the 
end of the snout (longer i in the young), as “long as or a little shorter 
than the parietals ; loreal usually longer than ‘deep ; ; one preocular, 
not touching the frontal; two or “three postoculars ; temporals 
2+ 2; nine (exceptionally ten) upper labials, fourth, fifth, and 
sixth (or fifth, sixth, and seventh) entering the eye; five (rarely 
four) lower labials in contact with the anterior chin-shields, which 
are shorter than the posterior. Scales more or less strongly keeled, 
in 17 rows. Ventrals 150-167; anal entire or divided; subcaudals 
113-155. Olive-brown above, uniform or with blackish cross- 
bands enclosing round whitish spots, or with whitish black-edged 
cross-bands ; upper lip whitish; ventrals and subcaudals olive on 
the sides, whitish, uniform or dotted or edged with olive, in the 
middle. 
Total length 1020 millim.; tail 420. 
From Mexico to Ecuador and the Guianas. 
a. Her. ¢ (V. 160; OC. Mexico. M. Sallé [C.]. 
123). 
b-e. 9 (V. 160, 167,160; Vera Paz, low forest. O. Salvin, Esq. [C.]. 
C. 113, 139, 116) & 
yg. (V. 166; C. 145). 
fF. & (V. 152; C.119). Guatemala. O. Salvin, Esq. [C.]. 
g-h. 2(V.160; C.128)  Chiriqui. F. D. Godman, Esq. 
& yg. (V. 150; C. [ea 
150). 
#2 (¥. 156; C. P). Guayaquil. (Type of HZ. brunneus.) 
k-m. & (Vv. 162, 151, W. Ecuador. Mr. Fraser [C.]. 
156; C. 117, 135, P) 
mee. 157: C0. P); 
n. Yg.(V. 159; C.140). Quito. 
o. Yg. (V. 150; C.155), Zaruma, Ecuador. J. a Gunter, Esq. 
[C.]. 
p. Yg. (V.162; C. 142). Venezuela. Mr. Dyson [C.]. 
q. Skull. Cayenne. 
7. Drymobius chloroticus. 
Dendrophidium chloroticum, Cope, Proc. Amer. Philos, Soc. xxiii. 
1886, p. 278. 
Drymobius chloroticus, Cope, Bull. U.S, Nat. Mus. no. 32, 1887, 
p- 69; Bocourt, Miss. Sc. Mex., Rept. p. 718, pl. 1. fig. 7 (1890). 
—— brunneus (non Giinth.), Bocourt, 1.0. 7 L fi fig..6, 
Maxillary teeth not more than 25, posterior rather strongly 
enlarged. Rostral broader than deep, visible from above ; inter- 
nasals shorter than the prefrontals ; frontal hardly once and a half 
as long as broad, as long as its distance from the end of the snout, 
a little shorter than the parietals ; loreal not or but slightly longer 
