190 COLUBRID. 
pits, more or less oblique, in 15 or 17 rows; ventrals rounded. 
Tail long ; subcaudals in two rows. 
Tropical America. 
Synopsis of the Species. 
I. Snout not thrice as long as the eye ; anal entire. 
Scales in 15 rows; two labials entering 
aC MOE DETERS oe 1. brevirostris, p. 190. 
Scales in 17 rows; a single labial bordering 
The OYO 00. sce svedee cence dewases 2. argenteus, p. 190. 
II. Snout thrice as long as the eye; anal divided. 
Dorsal scales keeled ; green above ...... 3. fulgidus, p. 191. 
Scales smooth or faintly keeled ........ 4. acuminatus, p. 192. 
1. Oxybelis brevirostris. 
yi mg brevirostris, Cope, Proc. Ac. Philad. 1860, 555, and 
ourn. Ac. Philad. (2) viii. 1876, p. 132, pl. xxvi. fig. 2. 
Oxybelis cerulescens, Jan, Elenco, p. 88 (1863), 
Snout once and a half as long as the snout, which scarcely 
projects beyond the lower jaw. Rostral twice as broad as deep, 
scarcely visible from above; internasals nearly as long as the pre- 
frontals; frontal twice to twice and a half as long as broad, 
narrower than the supraocular, as long as its distance from the end 
of the snout, as long as the parietals; no loreal, prefrontal in 
contact with two labials; one preocular, in contact with or 
narrowly separated from the frontal; one or two postoculars ; tem- 
porals very large, 1+ 2; six upper labials, third and fourth entering 
the eye; four lower labials in contact with the anterior chin- 
shields, which are much shorter than the posterior. Scales smooth 
or faintly keeled, in 15 rows. Ventrals 167-183; anal entire ; 
subcaudals 170-174. Olive or purplish above, pale green beneath ; 
a dark streak on each side of the head, passing through the eye. 
Total length 925 millim.; tail 385. 
Central America, Colombia, Ecuador. 
a. 3 (V. 183; 0.174), Chontalez, Nicaragua, R.A. Rix, Esq. [C.]; 
) i W. M. Cnet foay 
b. d (V. 167; 0.172). Pallatanga, Ecuador. Mr. C. Buckley [C. 
ms Bua y [C.]. 
2. Oxybelis argenteus. 
Coluber argenteus, Daud. Rept. vi. p. 386 (18038). 
_ ax apt Merr. ae p- oe (1820). 
ryiophis argentea, Schleg. Phys. Serp. ii. p. 258, pl. x. figs. 14 &15 
(1887) . Giinth. Cat. p. 155 (1858). Ee eee 
Oxybelis argenteus, Dum. § Bibr. vii. p. 815 (lee Steind. Novara, 
Rept. p. 73 (1867) ; Jan, Icon. Gén. 33, pl. iii. fig. 1 (1869). 
