A6 COLUBRID. 
which are as long as the posterior. Scales in 21 rows, smooth or 
very obtusely keeled. Ventrals 190-192; 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. 3 (V.190; C. 54).  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 
but 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 Ditypophis vivax. 
ventrals rounded. Tail short; subcaudals single. Hypapophyses 
developed throughout the vertebral column. 
Socotra. 
1. Ditypophis vivax. 
Ditypophis vivax, Giinth. Proc. Zool. Soc. 1881, p. 462, pl. 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 prefrontals; 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 preocular, forming a suture with the frontal ; a subocular 
below the preocular; two postoculars; temporals small, scale-like, 
2+83 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. Reddish 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; 0.87). Socotra. Prof. I. B. Balfour [C.)]. (Type.) 
