312 COLUBRIDiE. 



beneath, spotted with black ; posterior ventrals and aubcaudals black, 

 with light edges. 



Total length 303 millim. ; tail 34. 



^ 20. Atr actus trilineatus. 



Atractus Ivilineatus, Wagl. Isis, 1828, p. 742, pi. x. figs. 1-4. 



Rabdosoma lineatum, Dimi. Sf Bibr. vii. p. 105 (1854) ; Jan, Arcli. 

 Zool. Anat. Phys. ii. 1862, p. 17, and Icon. G4n. 11, pi. ii. fig. 5 

 (1865) ; Garm. Proc. Amer. Philos. 8oc. xxiv. 1887, p. 280. 



Rhabdosoma lineatum, part., Giinth. Cat. p. 11 (1858). 



Rabdosoma trivirgatum, Jan, II. cc. p. 17, pi. iii. fig. 1. 



punctatovittatum, Jan, II. ec. p. 17, pi iii. fig. 2. 



Geopliis lineatus, Ounth. Ann. ^ Mag. N. H. (4) ix. 1872, p. 15. 



Snout obtusely pointed. Eostral small, as deep as broad, visible 

 from above ; internasals small ; prsefrontals at least as long as 

 broad; frontal as broad as long, or a little broader than long, about 

 as long as its distance from the rostral, shorter than the parietals : 

 loreal at least twice as long as deep ; two postoculars (rarely one) ; 

 temporals 14-2, rarely 2 + 2; eight (rarely seven) upper labials, 

 fourth and fifth (or third and fourth) entering the eye ; four or five 

 lower labials in contact with the single pair of chin-shields, which 

 are rather elongate, moderately broad, and separated from the 

 symphysial. Scales in 15 rows. Ventrals 125-150 ; anal entire ; 

 subcaudals 11-19. Brown above, with three or four darker longi- 

 tudinal lines ; white beneath, uniform or with a few brown dots. 



Total length 225 millim. ; tail 15. 



Gruianas, Trinidad. 



a-e. cS {V. 125; 0. 18) & Berbice. 



$ (V. 137, 139 ; C. 12, 



14). 

 d. 9 (V. 131 ; 0. 11). Demerara River. S. S. Lawrence, Esq. 



[P.]. 

 e-f- S (V. 131 ; 0. 19) Maccasseema, Brit. W. L. Sclater, Ksq. 



& ? (V.140; C. 12). Guiana. [P.]. 



g. ? (V. 143; C. 13). Brit. Guiana. 



h-l 2 (V. 147, 140; 0. Trinidad. H. B. Guppy, Esq. 



13, 13) & yg. (V. 140, [P.]. 



136; 0.14,19). 

 m-q. c? (V. 129; C. 17) S. America. Mr. Mather [0.]. 



&yg.(V. 130,140,135, 



137' C 17 12 12 191 

 r. $ (V. 133; c! 12). ' S. America. 0. Baker, Esq. [P.]. 



2]. Atractus qnadrivirgatus. 



Rhabdosoma lineatum, part., Giinth. Cat. p. 11 (1858). 



Adelphicos quadrivirgatum, Jan, Arch. Zool. Anat. Phys. ii. 1862, 



p. 19, and Icon. Gen. 11, pi. iii. %. 5 (1805) ; F. Miill. Verh. nat. 



Ges. Basel, vi. 1878, p. 6.54 ; Bocourt, Miss. Sc. Me.r., Pept. p. 554, 



pi. xxxii. figs. 11 & 12 (1883j ; Giinth. Biol. C.-Am., Sept. p. 94 



(1893). 



