156. THAMNOBTNABTBS. 115 



56-70. Blackish above, the lateral scales edged with whitish, or 

 pale yellowish brown with numerous small brown spots and a large 

 blacMsh blotch on the nape ; uniform whitish beneath. 



Total length 1030 miUim. ; tail 160. 



Colombia, Venezuela, Guianas, Brazil, Paraguay. 



M-b,c. cj (V. 180; 0.70), Oarthagena, Colombia. 

 , 2 (V. 194; 0. 60), & 

 yg. (V. 196; 0.56). 



■d. c? (V. 189 ; 0. 70). Sta. Marta, Colombia. 



■e. Hgr. 2 (V. 168 ; 0. 53). Berbice, Brit. Guiana. Lady Essex [P.]. 



/: $ (V. 209; C. .P). Asuncion, Paraguay. Dr. J. Bohls [0.]. 



^ 



2. Ehinostoma vittatum. (Plate 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 prse- 

 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 prsBOcular, narrowly separated from the 

 frontal; two postoculars ; temporals 2+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 bands 

 uniting on the nape ; uniform whitish beneath. 



Total length (tail injured) 620 miUim. 



Argentina. 



a. cJ (V. 199 ; C. ?). Buenos Ayres. E. W. White, Esq. [0.]. 



156. THAMNODTNASTES, ^ 



Dryophylaz, Wagler, Syst. Amph. p. 181 (1830). 



Thamnodynastes, Wagl. I. c. p. 182 ; Giinth. Cat. Col. 8n. p. 163 



(1858) ; Jan,,Elenco sist. Ofld. p. 105 (1863). 

 Dipsas, part., Schleg. Phys. Serp. ii. p. 257 (1837) ; Bum. 4r Bibr. 



Erp. G4n. vii. p. 1133 (1854). 

 Tomodon, part., Oiinth. I. 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 

 border of the eye; mandibular teeth subequal. Head distinct 

 from neck ; eye large, with vertically elliptic pupil ; nostril in a 

 'flingle or semidivided shield. Body cylindrical; scales smooth or 

 keeled, with apical pits, in 17 or 19 rows ; ventrals rounded. Tail 

 moderate or rather long ; suboaudals in two rows. 



South America. 



i2 



