104 COLUBRID. 
ventrals with a suture-like Jateral keel, and a notch on each side 
corresponding to the keel. Tail long; subcaudals in two rows. 
West Africa. 
1. Hapsidophrys lineata. 
Hapsidophrys lineatus, Fischer, Abh. naturw. Ver. Hamb. iii. 1856, 
p. 111, pl. ii. fig. 5; Giinth. Cat. p. 144 (1858) ; Jan, Icon. Gén. 
33, pl. i. fig. 2 (1869); Mocquard, Bull. Soc. Philom. (7) xt. 1887, 
p- 76. 
Rostral broader than deep, just visible from above; internasals 
as long as the prefrontals ; frontal once and a half to once and two 
thirds as long as broad, as long as or a little longer than its distance 
from the end of the snout, as long as the parietals; loreal at least 
twice as long as deep; one preocular (rarely two), not touching the 
frontal; two postoculars; temporals 242 (rarely 1+2); eight 
or nine upper labials, fourth and fifth or fifth and sixth entering 
the eye; four to six lower labials in contact with the anterior chin- 
shields, which are as long as or a little shorter than the posterior. 
_ Seales in 15 rows, striated and keeled, the outer row without or 
with avery faint keel. Ventrals 158-170; anal entire; subcaudals 
95-158. Upper parts striated black and green, each scale green 
in the middle and black on the sides; upper lip and lower parts 
pale green or yellowish green. 
Total length 1100 millim.; tail 340. 
West Africa. 
gee (V. 170; C..95). Coast of Guinea. 
b-c. 9 (V. 167; C. 115) Ancobra River, Major Burton and Capt. 
& yg. (V.167; C. 121). Gold Coast. Cameron [P.]. 
ee. L673 "CO. 117). Ancobra River. Capt. Torry [P.]. 
ee VY. 165; C.?). Oil River. H. H. Johnston, Esq. [ P.]. 
f. Skeleton. W. Africa. 
70. THRASOPS. 
Thrasops, Hallow. Proc. Ac. Philad. 1857, p. 67. 
Thrasops, part., Cope, Proc. Ac. Philad. 1860, p. 556. 
Maxillary teeth 20 to 22, the three or four last longest and 
Fig. 9. 
AALS 
Maxillary and mandible of Thrasops flavigularis. 
separated from the rest by an interspace ; anterior mandibular teeth 
feebly enlarged. Head rather short, distinct from neck ; eye large, 
