128 COLUBRID.&. 
$B. Internasals longer than broad; scales in 19 rows; 
ventrals 202 ; subcaudals 93. 7. vitellinus, p. 133. 
6. Rostral much broader than deep; scales in 19 rows; 
ventrals 184-215; subcaudals 97-125. 
8. elegans, p. 138. 
C. Scales smooth or feebly keeled, in 21 or 23 rows; ventrals 
194-244, 
a. Snout obtuse or obliquely truncate. 
Subcaudals 114-124; loreal as long as 
deep; internasals shorter than the 
prefrontals..... cehtas Sac a's Wisk Sul 9. nattereri, p. 134. 
Subcaudals 88-106; loreal longer than 
deep; internasals shorter than the 
preofrontals. i... ...5 6250. +s se ee 10. serra, p. 134. 
Subcaudals 135 ; loreal, if present, twice 
as long as deep; internasals as long 
as the preefrontals ..............5: 11. burmeisteri, p. 135, 
b. Snout acutely pointed; subcaudals 152-135. 
12. baroni, p. 136. 
II. Ventrals 145; subcaudals 134 .... 13, inornatus, p. 136, 
1. Philodryas xstivus. | 
He as sestivus, part., Schleg. Phys. Serp. p. 186 (1837). 
Deyechyiee eestivus, Tees. & Bibr. Hb. iii Pigs) Ta Icon. 
Gén. 49, pl. iii. fig. (1879). 
Philodryas estivus, Giinth. Cat. p. 125 (1858). 2 
Dryophylax olfersii, part., Burm. Reise La Plata, ii. re 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. Rostral nearly as deep as broad, well visible 
from above ; internasals shorter than the prefrontals; 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 preocular, 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. 9 a 201; ©.120), Rio Grande do Sul. Dr. H. v. Ihering [C.}. 
b. 3 (V. 184; 0.121). Paraguay. Prof, Grant [P.}. 
e-e. dg (V.184,193;C. Uruguay. 
re 120) & 9(V. 188; 
f. & (V.192; 0.140), Argentina. Zoological Society. 
