56 REPTILES. 



of the eye 3'"; length of the eye 1£"'; length of head 13'"; 

 breadth of head 8'" ; length of trunk 34" ; length of tail 5". 



4. Xenodon rhabdocephalus. 



Coluber rhabdocephalus, Wied, Beitr. p. 355 ; Abbildg. lirr. x. 

 pi. 3, 4. Ophis merremii, Wayl. fy Spix, Serp. Brasil. pi. 12. 

 Ophis rhabdocephalus, Wagl. Syst. der Rept. p. 172. Coluber 

 decorus, Gravenhorst. Xenodon ocellatus, Boie, Isis, 1827, 

 p. 541. Xenodon rhabdocephalus, Schley. Ess. pi. 3. f. 10, 11 ; 

 Dum. Sf Bibr. vii. p. 758. 



Scales smooth, in very oblique rows ; anal bifid (sometimes 

 entire); snout not protruding, rounded in front; nostril mode- 

 rate; ventral plates 140-180; in the adult state head and body 

 more elongate than in Xenodon severus. Back with eighteen to 

 twenty large, lozenge- shaped, pale or black-edged spots, extend- 

 ing to both sides of the abdomen ; between the eyes a brown 

 cross band. 



a. Adult. Rio Janeiro. Presented by A. Fry, Esq. (3.) 



b, c. Adult and young. Brazil. 



d. Half-grown. Rio Janeiro. Presented by A. Fry, Esq. (4.) 



Dusky variety. 

 e,f. Half-grown and young. Rio Janeiro. Presented by A. 



Fry, Esq. (10.) 

 y. Half-grown. Brazil. Presented by Sir C. Stuart. 

 h. Half-grown. Brazil. Presented by Dr. Andrew Smith. 

 i. Young. Rio Janeiro. Presented by A. Fry, Esq. (13.) 

 k. Adult : has been dried. La Plata. 

 /. Half-grown. Brazils. 



m. Half-grown. Brazils. Presented by Mrs. Philips. 

 n. Half-grown. Brazils. 

 o, p. Young. Brazils. From the Haslar Collection. 



Var. A. Like former, but anal plate entire. 

 (/. Adult. Rio Janeiro. Presented by A. Fry, Esq. (2.) 



Var. B. Anal plate divided, but rostral high, triangular, behind 

 lanceolate, and reaching between both anterior frontals ; vertical 

 elongate, twice as long as broad, as long as the anterior and pos- 

 terior frontals together, longer than occipital. 



r. Half-grown. South America. Presented by W. F. Evans, 

 Esq. Vertical very narrow, more than twice as long as 

 broad. 



s. Half-grown. Demerara. Presented by Captain E. Sabine. 



t. Young. Brazils. 



