NO. 8 NEW AFRICAN UNGULATES — HELLER 5 



its northern limits, and here it meets the wide-spreading-horned 

 species B. cokei, but does not, apparently, actually occur with it 

 anywhere. 



How such a distinct type as Sigmoceros has come to inhabit terri- 

 tory intermediate between two fairly closely allied species, and yet 

 remain aloof from the territory of both does not at present admit of 

 any ready explanation. 



BUBALIS COKEI KONGONI, new subspecies 



Type from Loita Plains, Southern Guaso Nyiro River, British East 

 Africa ; adult male No. 162992, U. S. Nat. Mus. ; shot by Col. Theo- 

 dore Roosevelt, June 19, 1909; original (Heller) number 139. 



Characters.- — Similar to cokei but differing by lighter coloration, 

 the coat more purely buffy with very little reddish tint on the body, 

 the rufous of the forehead and snout of cokei replaced by tawny ; 

 skull averaging broader with wider and shorter horn pedicle. 



Coloration.- — Dorsal coloration tawny-ochraceous, the rump and 

 thighs lighter buff in color and showing considerable contrast from 

 the darker dorsal coloration ; sides of body buff in color and some- 

 what lighter than the medium dorsal area, merging imperceptibly 

 into the cream-buff of the underparts. Top of head slightly darker 

 than the back, tawny ; cheeks and throat lighter more buffy, the 

 latter pure buff in color; tip of chin hair-brown ; back of ears tawny- 

 ochraceous the inside clothed by cream-buff hairs. Front of legs 

 tawny from the hoofs to the knees and hocks ; back, and sides of 

 legs, cream-buff like the belly. Tail with black crest and tip, the 

 base buff like the rump. 



Measurements. — Head and body, 1,820 mm.; tail, 480; hind foot, 

 505 : ear, 210. 



Skull: Condylo-basal length, 402; greatest length (bifurcation of 

 horn pedicle to premaxillae tip), 455; nasal, 205; breadth of horn 

 pedicle, 94; length of horn pedicle from orbit to bifurcation, 114; 

 length of upper tooth row 90.5 ; distance from first premolar to 

 premaxillse tip, 139. 



The hartebeests inhabiting the highlands of the interior are dis- 

 tinctly lighter colored, or more purely buffy, in tone than those 

 from the low coast lands. The horn- and skull-variations are so 

 great, however, that definite skull-characters are hardly determin- 

 able. The horns show great age variation. In immaturity, they are 

 much less bracket-shaped with long slender points, but in old age, 

 when the teeth show much wear, the horn-points are also greatly 



