46 



COLUBEIPiE. 



which are as long as the posterior. Scales in 21 rows, smooth or 

 very obtusely keeled. Veatrals 190-19:2 ; anal entire ; subcaudals 

 54-55. Sand-coloured or pale buff, above, with a double alternating 

 series of square grey spots, a few of which may coalesce to form 

 transverse bars ; lips with vertical grey bars ; lower parts white. 



Total length 590 millim. ; tail 85. 



Zambesi ; Damaraland. 

 a. d (V. 190 ; C. 64). Zambesi. J. Chapman, Esq. [C.]. (Type.) 



143. DITYPOPHIS. 



Ditypophis, Giinth. Proc. Zool. Soc. 1881, p. 462. 



Maxillary teeth 8 or 9, strongly increasing in length to the last 

 hut one, followed, after an interspace, by a large, grooved fang ; 

 second to fifth mandibular teeth strongly enlarged, fang-like. Head 

 distinct from neck ; eye moderate, with vertically elliptic pupil. 

 Body short, cylindrical ; scales smooth, with apical pits, in 21 rows ; 



Maxillary and mandible of BitypopMs itivax. 



ventrals rounded. Tail short ; subcaudals single. Hypapophyses 

 developed throughout the vertebral column. 

 Soootra. 



1. Ditypophis vivax. 

 Ditypophis vivax, CHinth. Proc. Zool. Soc. 1881, p. 462, pi. xl. 



Snout short, broad ; rostral more than twice as broad as deep, 

 scarcely visible from above ; internasals a little longer than broad, 

 longer than the prsefrontals ; frontal not broader than the supra- 

 ocular, once and two thirds as long as broad, as long as its distance 

 from the end of the snout, shorter than the parietals ; nostril pierced 

 in the upper part of an undivided nasal ; loreal slightly longer than 

 deep ; one prseocular, forming a suture with the frontal ; a subocular 

 below the prseocular ; two postoculars ; temporals small, scale-like, 

 2-\-d or 4; eight upper labials, fourth and fifth entering the eye; 

 four lower labials in contact with the anterior chin-shields, which 

 are as long as the posterior. Scales in 21 rows. Ventrals 146 ; 

 anal entire ; subcaudals 37. Eeddish sandy above, with indistinct 

 darker cloudy spots on the back ; a dark streak on each side of the 

 head, passing through the eye ; lower parts white. 



Total length 345 millim. ; tail 50. 



Socotra. 



a. 2 (V. 146 ; C. 37). Socotra. Prof. I. B. Balfour [0.]. (Type.) 



