NO. 7 ANTELOPES FROM BRITISH EAST AFRICA HELLER 9 



southwest and bears no very close relationship to the other races. 

 The female specimens, although showing some racial color differ- 

 ences, do not parallel the males in their horn characters, but show 

 great individual variation in the length and the shape of these struc- 

 tures. The material available for study, however, is still quite inade- 

 quate to determine the extent of such variation. The highland races 

 known as G. g. roosevelti and G. g. robertsi are grasers, while the 

 desert forms, such as G. g. brighti and G. g. raineyi, are browsers. 

 Slight structural differences in the narial opening of the skull in such 

 races can already be noticed which are to be traced to such dif- 

 ferences in food habits. The narial opening in raineyi, for instance, 

 is always three or more millimeters greater than in G. g. roosevelti. 

 The snout is lengthening in the browsing races as indicated by the 

 lengthening of the narial opening in the browsing forms. 



The specimens most carefully studied in determining the geo- 

 graphical races of Gazella granti are the extensive series in the U. S. 

 National Museum. At this institution five out of the eight races are 

 represented by specimens of complete skins and skulls. The material 

 consists of 40 complete skins and skulls of adults, 31 of which are 

 male and 9 of which are female specimens. In addition there are 

 16 head skins with their skulls and 15 skulls unaccompanied by skins. 

 Besides this material the writer has examined and made notes upon 

 the types and other specimens in the British Museum and has also 

 made a cursory examination of specimens in the Berlin Museum. 



CEPHALOPHUS MONTICOLA MUSCULOIDES, new subspecies 

 Nandi Blue Duiker 



Type from Kagumega Forest, British East Africa; adult male, 

 Cat. No. 182388, U. S. National Museum; collected by Edmund 

 Heller, February 13, 1912; original number, 2709. 



Characters. — Underparts light colored, contrasting conspicuously 

 with the dark sides; body size greater; skull, 112 mm. in length. 



Coloration. — Median dorsal coloration of head and body fuscous, 

 merging on the sides and underparts to ecru-drab ; legs somewhat 

 darker than back, benzo brown ; hinder border of rump and base of 

 tail darkening to fuscous black ; terminal half of tail white ; the hair 

 basally fuscous. Midline of belly, throat to chin and inside of legs 

 whitish. Top of head to muzzle uniform fuscous, cheeks and orbital 

 region ecru-drab gradually shading into the whitish chin and throat ; 

 ears fuscous on back, the inner side whitish like throat. 



