462 AMBLYCEPHALIDZ. 
P Leptognathus (Dipsadomorus) cisticeps, Boettg. Zettschr. ges, 
aturw. lyiii, 1885, p. 237. 
Rostral as deep as broad or a little deeper than broad, scarcely 
visible from above; internasals not more than half the length of the 
prefrontals; frontal as long as broad or slightly longer than broad, 
as long as or shorter than its distance from the end of the snout, 
much shorter than the parietals; nasal entire; loreal not or but 
scarcely longer than deep, entering the eye; a preocular above the 
loreal; two postoculars ; temporals 1 or 24+2 or 3; eight to ten 
upper labials, fourth and fifth, fifth and sixth, or fourth, fifth, and 
sixth entering the eye; two lower labials in contact with each other 
behind the symphysial ; two to four pairs of chin-shields. Scales in 
13 rows, vertebral row strongly enlarged. Ventrals 171-200; anal 
entire; subcaudals 91-116. Yellowish, greyish, or reddish brown 
above, with more or less distinct dark cross-bands or triangular spots 
on the sides; a series of whitish spots, corresponding to the light 
interspaces along each side, partly upon the ventral shields; head 
with dark, light-edged spots; lower parts brownish, speckled with 
white. : 
Total length 680 millim.; tail 250. 
- Tropical South America. 
a. d (V. 198; C. 116). Demerara, Zoological Society. 
b. Hgr. (V. 185; C. 105). Bahia. Dr. O. Wucherer | C.}. 
. Hgr. (V. 191; C. 106). Ecuador. Mr. C. Buckley | C.}. 
d-e. ¢ (V.171; C.92) & Moyobamba, N.E. Mr. A.H. Roff{C.). 
2 (V.177; C. 91). Peru. ; 
Ff. 2 (V. 191; C. 99). Charocampa, Bolivia. 
g. 2 (V. 194; C. 101). —? Dr. Giinther [P.]. | 
A. Skull of e. 
5. PSEUDOPAREAS. 
Leptognathus, part., Jan, Elenco sist. Ofid. p. 100 (1863). 
Head distinct from. neck ; eye moderate, with vertical pupil. Body 
¢ylindrical ; scales smooth, in 15 rows, vertebral row slightly enlarged ; 
ventrals rounded; subcaudals in two rows. 
South America, 
1. Pseudopareas vagus. 
es ae vagus, Jan, l. c., and Icon. Gén. 37, pl. vi. fig. 2 (1870) ; 
ope 
, Proce. Ac. Philad, 1868, p. 186. 
Pareas vagus, Boettg. Ber. Offenb. Ver. Nat, 1888, p. 145. 
Rostral nearly as deep as broad ; internasals shorter than the pre- 
frontals; frontal a little longer than broad, as long as its distance 
from the end of the snout, much shorter than the parietals; loreal 
twice as long as deep, entering the eye; a small preocular between 
the loreal and the supraocular; two postoculars ; temporals 1+2; 
eight upper labials, fourth and fifth entering the eye; first lower 
labial in contact with its fellow behind the symphysial; three pairs 
