158. HEMIRHAGERRHIS, 119 
2. Tachymenis affinis. (Pxrare VII. fig. 1.) 
Very closely allied to the preceding, but maxillary longer, with 
more numerous solid teeth, viz. 15 instead of 10 to 12, and scales in 
17 rows. One preocular; 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 millim. ; tail 110. 
Peru. 
a. 3 (V. 153; C. 57). Muiia. Mr. W. Davis [C.] ; 
Messrs, Veitch | P.]. 
158. HEMIRHAGERRHIS. 
Hemirhagerrhis, Boetty. Zool. Anz. 1893, p. 119. 
Maxillary short, with 9 or 10 teeth gradually increasing in length 
and followed by en enlarged grooved fang situated below the posterior 
border of the eye; anterior mandibular teeth strongly enlarged. 
Head distinct from neck; eye small, with vertically subelliptic 
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, Boettg. t. c. p. 129; Stejneger, Proc. U.S. Nat. 
Mus. xvi. 1893, p. 729. 
Rostral nearly twice as broad as deep, scarcely visible from above ; 
internasals shorter than the prefrontals ; 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 preocular, 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; 
subcaudals 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. 2 (V. 148; C. 72). British East Africa. 
b. Hgr. (V. 173; C. 61). Mombasa. D. J. Wilson, Esq. [C.]; 
: G. Waller, Esq. | P.]. 
ce. Hgr. (V. 150; C. 66). Thiriati, E. Kikuyu. Dr.J. W. Gregory [P.], 
