312 COLUBRIDiE. 



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

 with light edges. 



Total length 303 millim. ; tail 34. 



River Mapiri, Bolivia. 



'20. Atractus trilineatus. 



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



Rabdosoma lineatum, Dum. ^- Bibr. vii. p. 105 (1854) ; Jan, Arch. 

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

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



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



Rabdosoma ti-ivii'gatum, Jan, II. cc. p. 17, pi. iii. fig. 1. 



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



Geopbis lineatus, Gimth. Atin. 4" Maff. N. H. (4) ix. 1872, p. 15. 



Snout obtusely pointed. Rostral 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 1 + 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. 



Guianas, Trinidad. 



«-c. S (V. 125; C. 18) & Berbice. 



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



14). 

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



[P.]. 

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



■& ? (V. 140; C. 12). Guiana. [P.]. 



g. 2 (V. 143 ; 0. 13). Brit. Guiana. 



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



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



136; C. 14, 19). 

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



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



137; C. 17, 12,12, 19). 

 r. $ (V. 133; C. 12). S. America. C. Baker, Esq. [P.]. 



21. Atractus quadrivirgatus. 



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



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



p. 19, and Icon. Gin. 11, pi. iii. tig. 5 (1865) ; F. Midi. Verk. nat. 



Ges. Basel, vi. 1878, p. 6-54 ; Bocuurt, Miss. So. Me.v., Kept. p. 554, 



pi. xxxii. figs. 11 & 12 (1883) ; Gimth. Biol. C.-Am., Rept. p. 94 



(1893). 



i 



