114 COLUBRID, 
d, e,f. §(V.197; C. 99), Bahia. Dr. O. Wucherer 
2 (V. 203; C.?), & [C.]. 
yg- (V. 194; C. 90). 
. do (V. 194; C. 98). Bahia. 
,, t, k,l. 3 (V. 204; C. Pernambuco, J.P. G. Smith, Esq. 
91), 2 (V. 192, 203; [P.]. 
C. 82, 80), & yg. (V 
201; C. 82). 
m. Yg. (V. 195 ; C.77). Pernambuco. 
155. RHINOSTOMA. 
P Rhinostoma, part., Fitzing. N. Class. Rept. p. 29 (1826). 
Rhinostoma, Dum. § Bibr. Erp. Gén. vii. p. op (1854) ; Jan, Elenco 
sist. Ofid. p. 91 (1863). 
Rhinostoma, part., Giinth. Cat. Col. Sn. p. 8 (1858). 
Maxillary teeth 10, subequal, followed, after an interspace, by a 
pair of moderately enlarged grooved teeth situated below the pos- 
terior border of the eye; mandibular teeth subequal. Head slightly 
distinct from neck; eye rather small, with vertically elliptic pupil ; 
rostral very large, with sharp horizontal edge. Body cylindrical ; 
scales smooth, with apical pits, in 19 rows; ventrals rounded or 
obtusely angulate laterally. Tail moderate; subcaudals in two 
rows. » 
South America, 
1. Rhinostoma guianense. 
~ Heterodon guianensis, Zrosch, in Schomb, Reise Brit. Guian. iii. 
p» 653 (1848). 
Rhinostoma nasuum (non Wagl.*), Dum. §& Bibr. vii. p. 994 (1854) ; 
Giinth. Cat. p. 8 (1858); Jan, Icon. Gén, 34, pl. v. figs. 1 & 2 
(1870). 
Rhinostoma guntheri, Cope, Proce. Ac. Philad. 1860, p. 243. 
Snout short, turned up. Outline ‘of rostral rounded, the lower 
surface of the shield broader than long, its upper surface at least as 
long as its distance from the frontal; internasals a little shorter 
than the prefrontals; latter forming a short median suture or in 
contact with their inner angles only, or even narrowly separated 
from each other; frontal as long as broad or a little longer than 
broad, as long as or a little shorter than its distance from the end 
of the snout, as long as the parietals ; loreal longer than deep; one 
preocular (sometimes divided), widely separated from the frontal ; 
two (rarely three) postoculars ; temporals 243; eight upper labials, 
fourth and fifth entering the eye; four lower labials in contact with 
the anterior chin-shields; posterior chin-shields small, scale-like. 
Scales in 19 rows, Ventrals 168-209; anal entire; subcaudals 
* The Vipera (Rhinostoma) nasua of Wagler, Syst. Amph. p. 171, is, to 
ay Pig the definition given, probably identical with Lysteophis dorbignyi, 
