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of female about 14 inch long, basal diameter going about 3 times in the 
length. 
Dimensions :—Height much as in C. monticola, length of ear 1:6 inch, 
hind foot 6:1. 
Skull (¢): basal length (c.) 4:6 inches, greatest breadth 2°4, anterior 
edge of orbit to muzzle 2:5. 
Hab. Africa south and east of the Niger, extending from the Cameroons to 
Angola and eastwards to the coast opposite Zanzibar. 
To the east and south of the Niger Delta, Maxwell’s Duiker appears to be 
represented by the present species, which, as we have explained above, is of 
the same size and closely resembles it in most particulars. 
The Black-rumped Duiker was first described by Gray in an article on new 
species of this group, published in the ‘Annals and Magazine of Natural 
History’ for 1846, from specimens in the British Museum, transmitted from 
Fernando Po by James Thompson, one of Lord Derby’s collectors. Shortly 
afterwards it was figured in the ‘Knowsley Menagerie’ by Waterhouse 
Hawkins from living specimens brought home by the same traveller. 
We will now endeavour to give some idea of the range of this still 
imperfectly-known species. Beginning on the north, we find skins of it in the 
British Museum obtained in the wooded district of Cameroons and transmitted 
to the British Museum by the late Captain Burton and by Crossley, besides 
the typical specimens received from Fernando Po, which were probably 
originally obtained from the adjoining mainland. Herr Matschie, in an article 
on the Mammals of the Cameroons, published in 1891, likewise records the 
occurrence of this species in the Wuté district of that country, as testified by 
a skull sent to Berlin by Lieut. Morgen. From Gaboon there is a skin of an 
adult male in the British Museum, obtained by Mr. DuChaillu, and a specimen 
in the Berlin Museum procured by Buchholtz. To the south of the Congo 
this Duiker has been obtained at Capangombé in Angola by the well-known 
Portuguese collector Anchieta. M. de Bocage in 1878 based a new species 
on these specimens and proposed to dedicate it to M. d’Anchieta, having been 
misled by the indifferent figure and imperfect description of C. melanorheus 
given in the ‘ Knowsley Menagerie.’ But there appears to be no reasonable 
doubt that they may be properly referred to C. melanorheus. 
How far the Black-rumped Duiker extends over the forests of the Congo 
