12 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. t>0 



feed. Surrounding this moorland on the slopes of the range is a 

 dense forest of bamboo, including a scattered growth of trees. On 

 the lower slopes the trees form a solid dense forest to the exclusion 

 of the bamboo. This fringing forest is not inhabited by any of the 

 Sylvicapra duikers, which are strictly plains or bush duikers, but 

 serves as a barrier to their migration downwards to the plains, 

 which are inhabited by another closely allied race, hindei. 



We have the same conditions duplicated on Mount Kenia, the 

 same race of high mountain duikers S. g. altivallis, inhabiting the 

 moorland down to the beginning of the dense bamboo and forest 

 zone which absolutely limits their lower vertical range, and keeps 

 them apart from their close allies of the plains below. 



OUREBIA MONTANA ^QUATORIA, new subspecies 

 Nile Oribi 



Type from Rhino Camp, Lado Enclave; adult male, No. 164713, 

 U. S. Nat. Mus. ; shot by Col. Theodore Roosevelt, January 12, 

 1910; original (Heller) number, 608. 



Characters. — Nearest cottoni, but differing by the smaller, less 

 vertical horns, which are less heavily ringed and lighter ; dorsal 

 coloration with darker tips to the ears and a few dark hairs in the 

 tip of the tail; hair shorter; horns much heavier than montana, but 

 slanting backward at same angle, tympanic bullae and nasal bones 

 larger. Intermediate in horn characters between cottoni and mon- 

 tana, but coloration nearer cottoni. 



Coloration. — Dorsal color running-brown, vermiculated by Van- 

 dyke-brown ; neck, rump and sides without the darker vermiculation, 

 and tawny in color; crown of head bright rufous, bordered on sides 

 by a broad white supraorbital band ; snout and sides of face, buffy, 

 the rhinarium bordered above by a broccoli-brown patch. Tail 

 tawny like rump, with a few black hairs in tip, bordered below by a 

 few white hairs. Limbs tawny like sides, the clefts of hoofs and 

 posterns whitish. Ears, on outside, buffy with extreme tip seal- 

 brown, lined on inside by long white hairs. Under parts and inside 

 of limbs silky white; the hair white to the roots ; chest suffused with 

 buff v ; throat ochraceous buff ; chin, upper lips and gular region 

 white. 



Skull : Mature adult, all the cheek-teeth showing considerable 

 wear ; skull large and heavy ; raised and bulging on dorsal profile 

 along lachrymal nasal suture where the lachrymal projects laterally 

 and roofs over the immense anteorbital fossa ; nasals very large and 



