CALLIRHINUS PATAGONIENSIS. JSg 



Fig. 4, an upper view of the head. 

 Fig. 5, a lower view of the same. 

 Fig. 6, the vent and preanal scutella. 

 Fig. 7, the dorsal scales. 



Genus CALLIRHINUS, Girard. 



Char. gen. — Capite et corpore coluTjrifoiinibiis, Rostro suhconico, ultra 

 maxUlam iiiferiorem protenso. Scuto verticis eJongato, rostrali 

 convexo. Sciitis nasalihus cluobus ; nare in sutura sita. Scutis 

 loreis duohus, praeorbitali una, postorhikdihus diiohus ; lahlcdihus 

 tertio et quarto in orhitam prodiictis. Squamis modicis, laevihus, 

 Scutella praeaiiali divisa. ScuteUis subcaudalihus in serieyn duplicem 

 ordinatis. 



Gen. Chae. — Head and body colubrine. Snout subconical, protruding 

 beyond the lower jaw. Vertex plate elongated. Rostral convex. 

 Two nasal plates, with nostril between them. Two loral plates. 

 One anteorbital and two postorbitals. Third and fourth upper 

 labials entering into the orbit. Scales moderate, smooth. Preanal 

 scutella divided. Subcaudal scutellae disposed upon a double series. 



Syn. — CalUrhinus, Grd. in Proc. Acad. Nat. Sci. Philad. August, 1857, p. 182. 



Observ. — This genus is related to RhinecJiis and Pltiiophls ; the 

 labial plates are less numerous than in the latter two genera, and so 

 also are the series of dorsal scales. The teeth are uniform and mo- 

 derately developed. The eye is large, and the pupil circular. The 

 preanal scutella is subdivided, as in RJdnechis. 



Callirhinus patagoniensis, Grd. 

 (Plate XII, figs. 1-6.) 



Char. spec. — Squamis in novemdecim series longitudi7iales dispositis. 

 Colore olivaceo, nigro-macidato. 



