158. HEMIEHASEREHIS. 119 



2. Tachymenis affinis. (Plate VII. fig. 1.) 



Very closely allied to the preceding, but maxillary longer, -with 

 more numeroua solid teeth, -yiz. 15 instead of 10 to 12, and scales in 

 17 rows. One prseocular; temporals 2+3; eight upper labials, 

 fourth and fifth entering the eye. Ventrals 153; anal divided; 

 subcaudals 57. Brown above, darker on the four outer rows of 

 scales, with a few small darker spots ; a dark oblique streak behind 

 the eye ; grey beneath, much spotted with black. 



Total length 520 miUim. ; tail 110. 



Peru. 



a. cJ (V. 153; C. 57). Muna. Mr. W. Davis [0.] ; 



Messrs. Veitch [P.]. 



158. HEMIRHAGEERHIS. 

 Hemirhagerrhis, Boettg. Zool. Am. 1893, p. 119. 



Maxillary short, with 9 or 10 teeth gradually increasing in length 

 and followed by an enlarged grooved fang situated below the posterior 

 border of the eye ; anterior mandibular teeth strongly enlarged. 

 Head distinct from neck; eye small, with vertically subelliptio 

 pupil; nasal semidivided, the cleft horizontal. Body cylindrical; 

 scales smooth, with apical pits, in 17 or 19 rows ; ventrals rounded. 

 Tail moderate ; subcaudals in two rows. 



East Africa. 



1. Hemirhagerrhis kelleri. 



Hemirhagerrhis kelleri, Boeftg. t. c. p. 129 : Stejneger, Proe. U.S. Wat. 

 ilfMS. xvi. 1893, p. 729. 



Rostral nearly twice as broad as deep, scarcely visible from above ; 

 internasals shorter than the prsefrontals ; frontal twice to twice and 

 a half as long as broad, longer than its distance from the end of the 

 snout, as long as or shorter than the parietals ; loreal longer than 

 deep ; one praeooular, extending to the upper surface of the head 

 but not reaching the> frontal; two postoculars ; temporals 2+2, 

 2+3, or 2+4; eight upper labials, fourth and fifth entering the 

 eye ; four or five lower labials in contact with the anterior chin- 

 shields, which are as long as or shorter than the posterior. Scales 

 in 17 (exceptionally 19) rows. Ventrals 148-173; anal divided; 

 subcaTidals 61-78. Greyish or yellowish brown above, with a dark 

 grey or olive, black-edged vertebral band and another on each side, 

 passing through the eye ; head lineolated with blackish ; upper lip 

 blackish ; lower parts with brown longitudinal lines disposed in 

 pairs. 



Total length 270 millim. ; tail 83. 



Somaliland, East Africa. 



a. $ (V. 148; C. 72). British East Africa. 



6. Hgr. (V. 173 ; 0. 61). Mombasa. D. J.Wilson, Esq. [C] : 



G. Waller, Esq.TPri. 

 c. Hgr. (V. 150 ; 0. 66). Thiriati, E. Kikiiyu. Dr. J. W. Gregory [P.]. 



