42. BOTHROLToirs. 325 



supraocular, as long as or slightly longer than its distance from the 

 end of the snout, as long as the parietals ; loreal elongate, separated 

 from the eye by the lower praeocular ; two (or three) prseoculars, 

 upper largest; two postoculars ; temporals 2+3; seven or eight 

 upper labials, fourth and fifth entering the eye ; four lower labials 

 in contact with the anterior chin-shields, which are as long as or 

 lunger than the posterior. Scales strongly keeled, in 23 rows 

 Ventrals 190-205 ; anal entire ; suhcaudals 64-82. Head yel- 

 lowish or reddish brown, with black spots and two pairs of oblique 

 black lines, the outer passing through the eye ; body blackish brown, 

 uniform, or with yellow lines ; lower part^ uniform yellowish. 



Total length 920 millim. ; tail 165. 



"West and Central Africa. 



A. Uniform blackish brown above. 

 a. 2 (V. 205 ; C. 75). - Fernando Po. (Type of B. bnmneus.) 



B. With five yellowish longitudinal streaks, which are 

 narrower than the interspaces. 



6. 2 (V. 195 ; C. 63). Oil River, W. Africa. H. H. Johnston, Esq. 



c. 2 (V. 194 ; C. 64). Akassa, mouth of Dr. J. W". Crosse [P.]. 



Niger. 



d. Hgr. (V. 190; C. 68). Sem.uio, C. Africa. Hr. Bohndorif [C.]. 



C. With five yellowish longitudinal streaks, which are as 

 broad as the interspaces. 



e. 5 (V. 202 ; C. 74). Ashantee. Mr. McCarthy [C.]. 



42. BOTHROLYCUS. 



Bothrolycus, Glinth. Proc. Zool. Soc. 1874, p. 444. 



Maxillary teeth 20, forming a continuous series, the six antferior 

 strongly enlarged ; anterior mandibular teeth strongly enlarged. 



Fis. 20. 



Maxillary and mandible ot Bothrolycus ater. 

 Head distinct from neck; eye rather small, with round pupil; 

 loreal region deeply concave, the pit entering the eye. Body short, 

 cylindrical ; scales smooth, without apical pits, in 19 rows ; ventrals 

 rounded. 'Tail very short; suhcaudals in two rows. Hypapo- 

 physes developed throughout the verfebral column. 

 West Africa. 



