4. Bins. 



499 



(So. 25, 27, 23, 25, 25; 



V. 113, 112, 113, 113, 



144 ; C. 20, 19, 22, 



19, 29). 

 o-y. 2 (So. 22, 25, 25; 



V. 143, 186, 139; 0. 



28, 23, 25). 

 r. 2 (Sc. 27; V. 138; 



0. 21). 

 t-t. 2 (Sc. 23, 23 ; V. 



130, ? ; C. 19, 18). 



Damaraland, 



Mossamedes. 

 Benguela. 



Dr. Welwitsch [P.]. 



J. J. Monteiro, Esq. [P.]. 



7. Bitis gabonica. 



Cerastes nasicornis {rum Shaw), HaMow. Proa. Ac. PhilaA. 1847, 



p. 319, pi. — . 

 Echidna gabonica, Dum. 8r Bibr. vii. p. 1428, pi. Ixxx. 6. (1854). 

 Vipera rhinoceros, Schleg. Versl. Ah. Armterd. iii. 1855, p. 316; 



Stranch, Syn. Viper, p. 91 (1869) ; Bocage, Serp. Angola, p. 149 



(1895). 

 Echidna rhinocerog, A. Dum. Rev. Sf Mag. Zool. 1856, p. 559, and 



Arch. Mus. x. 1859, p. 220. 

 Clotho rhinoceros. Cope, Proc. Ac. Philad. 1859, p. 340. 

 Bitis rhinoceros, Peters, Mon. Berl. Ac. 1877, p. 618, and JReise n. 



Mossamb. iii. p. 146 (1882) ; Biittihofer, Meiseb. Liberia, ii. p. 444, 



pi. 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; suboaudals 17-33. 

 Brown above, with a vertebral series of elongate, quadrangular, 

 yellowish or Ught 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 behiad the eye, widening towards 

 the mouth ; yellowish beneath, with small brown or blackish spots. 



Total length 1170 mHUm. ; tail 70. 



Tropical Africa (West Africa, from Liberia to Damaraland; 

 Zanzibar ; Mozambique). 



«. Tg. (Sc. 35 ; V. 128 ; Coast of Guinea. Sir A. Smith [P.]. 



C. 21). 

 b. Head of adult. Oil River. Sir H. H. Johnston [P.]. 



e. Head of adult. Angola. J. J. Monteiro, Esq T.]. 



2k2 



