4, BITIS. 499 
(Se. 25, 27, 23, 25, 25 ; 
V. 113, 112, 118, 118, 
144; ©. 20, 19, 22, 
19, 29). 
o-q. 2 (Se. 22, 25, 25; Damaraland. 
V. 143, 136, 189; C 
28, 23, 25). 
r, é (Se. 27; V. 138; Mossamedes. Dr. Welwitsch [P.]. 
8- ese. 28, 23; V. Benguela. J. J. Monteiro, Esq. [P.]. 
19 
130, ?; C. 19, 18). 
7. Bitis gabonica. 
Cerastes — (non Shaw), Hallow. Proc. Ac. Philad. 1847, 
319, p 
Bckidan’ eal pabouica, Dum. § Bibr. vii. p.1428, pl. xxx. 6. (1854). 
Vipera rhinoceros, Schleg. Versi. ‘Ak. Amsterd. iii. 1855, p. 316; 
trauch, Syn. Viper. p. 91 (1869); Bocage, Herp. Angola, p. 149 
(1895). 
Kchidna rhinoceros, A. Dum. Rev. § Mag. Zool. 1856, p. 559, and 
Arch. Mus. x. 1859, p. 220. 
Clotho rhinoceros, Cope, Proc, Ae. Philad, 1859, p. 340. 
Bitis rhinoceros, Peters, Mon. Berl. Ac. 1877, p. 618, and Reise n. 
Mossamb. iii. p. 146 (1882) ; Biittekofer, Boiteb. Liberia, i ii. p. 444, 
pl. xxxii. (1890). 
Nostrils directed upwards and outwards. Rostral very small, 
once and a half to twice and a half as broad as deep; head covered 
with small, moderately keeled scales, smallest on the vertex, 13 to 16 
from eye to eye; 15 to 19 scales round the eye; four or five series of 
scales between the eye and the labials; a pair of more or less 
developed, compressed, erectile, triangular, sometimes bi- or tricuspid 
shields, in contact with each other, between the supranasals, forming 
a pair of nasal “ horns” ; four or five series of scales between the nasal 
and the rostral; 13 to 16 upper labials; four or five lower labials 
in contact with the chin-shields. Scales in 33-41 rows, strongly 
keeled, outer row smooth; lateral scales slightly oblique, pointing 
downwards. Ventrals 125-140; anal entire; subcaudals 17-33. 
Brown above, with a vertebral series of elongate, quadrangular, 
yellowish or light brown spots connected by hourglass-shaped dark 
brown markings; a series of crescentic or angular dark brown 
markings on each side ; head pale above, with a dark brown median 
line; a dark brown oblique band behind the eye, widening towards 
the mouth; yellowish beneath, with small brown or blackish spots. 
Total length 1170 millim.; tail 70. 
Tropical Africa (West Africa, from Liberia to Damaraland ; 
Zanzibar ; Mozambique). 
a, Rae (Se. 35; V. 128; Coast of Guinea. Sir A. Smith [P.]. 
21). 
6. Head of adult. Oil River. Sir H. H. Johnston [P.]. 
c. Head of adult. Angola. J.J. ase Esq ‘P.}. 
