104 



COLUBRID.f:. 



ventrals with a suture-like lateral keel, and a notch on each side 

 corresponding to the keel. Tail long ; subcaudals in two rows. 

 West Africa. 



1. Hapsidophrys lineata. 



Rostral broader than deep, just visible from above; internasals 

 as long as the prajfrontals ; 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 praeocular (rarely two), not touching the 

 frontal ; two postoculars ; temporals 2 -f 2 (rarely 1 -f 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. 

 Scales in 15 rows, striated and keeled, the outer row without or 

 with a very faint keel. Ventrals 158-] 70 ; 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 millira. ; tail 340. 



West Africa. 



a. $ (V. 170 ; C. 95). 

 b-c. $ (V. ]67; C. 115) 



Coast of Guinea. 



Ancobra River, Major Burton and Capt. 

 Cameron [P.]. 



Capt. Torry [P.]. 



H. H. Johnston, Esq. [P.]. 



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. 



Maxillary and mandible of Thrcaops flavigularis. 



separated from the rest by an interspace ; anterior mandibular teeth 

 feebly enlarged. Head rather short, distinct from neck ; eye large, 



