114 COLUBRIDiB. 



^,e,/-(?(V. 197; 0.99), Bahia. Dr. 0. Wucherer 



2 (V. 203; 0. ?), & [0.]- 



yg. (V. 194 ; 0. 90). 

 ff. (J (V. 194 ; 0. 98). BaHa. 



h, i, h, I. S (V. 204 ; 0. Pemambuco. J. P. G. Smith, Esq. 



91), $ (V. 192,203; [P.]. 



C. 82, 80), & yg. (V. 



201 ; 0. 82). 

 m. Yg. (V. 195 ; 0. 77). Pemambuco. 



^ 155. RHINOSTOMA. 



? EHnostoma, part., Fitzing. N. Class. Sept. p. 29 (1826). 

 Rhinostoma, Dum. i^ Bibr. Erp. G4n. vii. p. 992 (1854) ; Jan, JElenco 



sist. OJid. p. 91 (1863). 

 Ehinostoma, part., Gilnth. Cat. Col. Sn. p. 8 (1858). 



Maxillary teetli 10, subequal, followed, after an interspace, by a 

 pair of moderately enlarged grooved teetli 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 ; suboaudals in two 

 rows. 



South America. 



^ 1. Rhinostoma guianense. 



Heterodon guianensis, Trosch. in Schomb, Jieise Brit. Guian, iii., 



p. 658 (1848). 

 Rhinostoma nasuum (ncn Wagl.*), Dum. Sr Bib?: vii. p. 994 (1854) ; 



Giinih. Cat. p. 8 (1858) ; Jan, Icon. Gin. 34, pi. v. figs. 1 & 2 



(1870). 

 Ehinostoma guntheri, Cope, Proo. 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 prsefrontals ; 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 

 prsBocular (sometimes divided), widely separated from the frontal ; 

 two (rarely three) postooulars ; temporals 2+3 ; eight upper labials, 

 fourth and fifth entering the eye ; four lower labials in contact with 

 the anterior chin-shields ; posterior chia-shields small, scale-like. 

 Scales in 19 rows. Ventrals 168-209; anal entire; subcaudals 



* The Vvpera (Bhinostoma) nasua of Wagler, Syst. Ampb. p. 171, is, to 

 judge by the definition given, probably identical with Lystrophis dorbigm/i, 

 D.&B. 



