ol COLUBRID. 
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 tvilineatus, Wagl. Isis, 1828, p- 742, pl. x. figs. 1-4. 
Rabdosoma lineatum, Dum. § Bibr. vii. p. 105 (1854) ; Jan, Arch. 
Zool. Anat. Phys. ii. 1862, p. 17, and Icon. Gén, 11, pl. il. fig. 5 
(1865) ; Garm. Proc. Amer. Phitos. Soc. xxiv. 1887, p. 280. 
Rhabdosoma lineatum, part., Giinth. Cat. p. 11 (1858). 
Rabdosoma trivirgatum, Jan, /l. ec. p. 17, pl. iii. fig. 1. 
punctatovittatum, Jan, ll. ec. p. 17, pl iii. fig. 2. 
Geophis lineatus, Giinth. Ann. § Mag. N. (4) ix. 1872, p. 15. 
Snout obtusely pointed. Rostral small, as deep as broad, visible 
from above; internasals small; prefrontals 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 142, 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, 
a-c. § (V.125; ©.18) & Berbice. 
Q (V. 137, 139; C. 12, 
14). 
Moe tVakols C.11), Demerara River. 8. 8S. Lawrence, Esq. 
Pei. 
e-f. d (V. 1381; C.19) Maccasseema, Brit. wi i Sclater, Esq. 
& 2 (V. 140; ic. 12), : Guiana. (ae 
g. 2 (V. 148; 0. 13). Brit. Guiana. 
A-l. 2 (V. 147, 140; C. Trinidad. H. B. Guppy, Esq. 
13, 138) & yg. (V. 140, ane 
136; C. 14, 19). 
m-g. d6 (V. 129; C.17) 8S. America. Mr. Mather [C.]. 
& yg. (V. 130, 140, 135, 
137; C. 17, 12 Be bei) 
r OLY, 183; C. 12). S. America. C. Baker, Esq. [P.]. 
21. Atractus quadrivirgatus. 
Ithabdosoma lineatum, part., Giinth. Cat. p. 11 (1858 
Adelphicos quadrivirgatum, ‘Jan, Arch, Zool. Anat. Phys. ii. 1862, 
p- 19, and Icon. Gén, 11, pl. iii. fig. 5 (1865) ; F. Mill. Verh. nat. 
Ges. Basel, vi. 1878, p. 654; Bocour t, Miss. Se. Mex., Rept. p. 554, 
iF heat fies. 1] & 12 (1883) ; Ginth, Biol. C-Am., Rept. p. 94 
(1893) 
=— 
