156. THAMNODYMASTES, 115 
56-70. Blackish above, the lateral scales edged with whitish, or 
pale yellowish brown with numerous small brown spots and a large 
blackish blotch on the nape; uniform whitish beneath, 
- Total length 1030 millim.; tail 160. 
Colombia, Venezuela, Guianas, Brazil, Paraguay. 
a-b, ce, 3 (V.180; ©. 70), Carthagena, Colombia. 
(V. 194; C. 60), & 
g. (V. 196; OC. 56), 
d. a ‘(V. 189; 0. 70). Sta. Marta, Colombia. 
£. re . s ie C.53). Berbice, Brit. Guiana, me Essex 
Ff, 2 (V. C. ?). Asuncion, Paraguay. . Bohls Gi 
2. Rhinostoma vittatum. (Prats V. fig. 3.) 
Snout acutely pointed. Rostral subtrihedral, obtusely keeled 
above, its lower surface as long as broad, its upper surface as long 
-as its distance from the frontal ; internasals shorter than the pre- 
frontals; frontal a little longer than broad, as long as its distance 
from the end of the snout, slightly longer than the parietals ; loreal 
longer than deep; one preocular, narrowly separated from the 
frontal; two postoculars; temporals 24+3; eight upper labials, 
fourth and fifth entering the eye; four lower labials in contact 
with the anterior chin-shields, which are a little larger than the 
posterior. Scales in 19 rows. Ventrals 199; anal entire. Pale 
yellowish brown above, with two dark brown longitudinal neats 
uniting on the nape; uniform whitish beneath. 
Total length (tail injured) 620 millim. 
Argentina. 
a, 3 (V. 199; C. ?). Buenos Ayres. E, W. White, Esq. [C.]. 
156. THAMNODYNASTES, 
Dryophylax, Wagler, Syst. Amph. p. 181 (18380). 
Thamnodynastes, Wagl. 1. c. p. ey Giinth. Cat, Col. Sn. p. 168 
(1858) ; Jan, Elenco sist. Ofid. p . 105 (1863). 
Dipsas, part., Schleg. Phys. Serp. ye p. 257 (1887); Dum. § Bibr. 
Erp. Gén, vii. p. 1133 (1854). 
Tomodon, part., Giinth. 1. c. p. 52. 
Mesotes, part., Jan, Arch. Zool. Anat. Phys. ii. 1863, p. 306. 
Maxillary teeth 13-18, subequal, followed, after an interspace: 
by a pair of enlarged, grooved teeth situated below the posterior 
‘order of the eye; mandibular teeth subequal. Head distinct 
from neck; eye large, with vertically elliptic pupil; nostril in a 
single or semidivided shield. Body cylindrical; scales smooth or 
keeled, with apical pits, in 17 or 19 rows; ventrals rounded. Tail 
moderate or rather long; subcaudals in two rows. 
South America. 
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