128 COLXTBRIDJS. 



(3. Internasals longer than broad; scales in 19 loyra; 

 ventrals 202 ; snbcaudals 93. 7. vitelUnus, p. 133. 



b. Eostral muoh broader than deep ; scales in 19 rows ^ 

 ventrals 184-215 ; subcaudals 97-125. 



8. elegans, p. 133. 



C. Scales smooth or feebly keeled, in 21 or 23 rows; ventral* 

 194-244. 



a. Snout obtuse or obliquely truncate. 



Subcaudals 1 14-124 j loreal as long as 



deep ; internasals shorter than the 



praefrontals 9. nattereri, p. 134, 



Subcaudals 88-106 ; loreal longer than 



deep; internasals shorter than the 



praefrontals 10. serra, p. 134. 



Subcaudals 135 ; loreal, if present, twice 



as long as deep ; internasals as long 



as the prsefrontals 11. hurmeisteri, p. 135, 



b. Snout acutely pointed ; subcaudals 1.32-135. 



12. baroni, p, 136. 



II. Ventrals 145 ; subcaudals 134 .... 13. inornatus, p. 136. 



^ 1. PMlodryas sestivus. 



Herpetodryaa festivus, part., Schleg. Phys. Serp. p. 186 (1837). 

 Dryophylax sestivus, Dum. Sr Bihr. vii. p. 1111 (1864) ; Jan, Icon, 



Gen. 49, pi. iii. fig. (1879). 

 Philodryas sestivus, Gunth. Cat. p. 125 (1858). 

 Dryophylax olfersii, part., Burm. Seise La Plata, ii. p. 529 (1861). 

 Philodryas carinatus, Hensel, Arch.f. Nat. 1868, p. 332. 

 Tropidodryas sestivus, Cope, Proc. Amer. Philos. Soc. xxii. 1885, p. 192, 



Diameter of eye about half length of snout ; latter rather 

 pointed, prominent. Eostral nearly as deep as broad, well visible 

 from above ; internasals shorter than the prsefrontals ; frontal once 

 and a half to once and two thirds as long as broad, as long as or a 

 little longer than its distance from the end of the snout, shorter 

 than the parietals ; loreal longer than deep ; one prasocular, in 

 contact with or narrowly separated from the frontal ; two post- 

 oculars ; temporals 1 + 2 ; eight upper labials, fourth and fifth 

 entering the eye ; five lower labials in contact with the anterior 

 chin-shields, which are as long as or longer than the posterior. 

 Scales keeled, with double pits, in 21 rows. Ventrals rounded, 

 184-201 ; anal divided ; subcaudals 120-140. Uniform green 

 above, yellowish beneath. 



Total length 1050 millim.; tail 310. 



Southern Brazil, Paraguay, Uruguay, Argentina. 



a. 2 (V. 201 ; 0. 120). Eio Grande do Sul. Dr. H. v. Ihering{C.]. 



b. S (V. 184 ; 0. 121). Paraguay. Prof. Grant [P.], 

 c-e. (? (V. 184, 193 ; 0. Uruguay. 



126,120)&$(V.188; 

 0.?). 

 f. e (V. 192 ; C. 140). Argentina. Zoological Society. 



