148 PAP 10 



of zygoma, straight, not flaring outward at bottom as in the skull of 

 allied species ; rostrum broader posteriorly ; palate of equal width 

 throughout its length ; orbital ridge straight, not depressed in center ; 

 septiun narrower, orbits more round. 



Color. Adult Male. Face flesh color ; callosities red ; forehead 

 covered with black hairs banded with white, this color rising to the 

 crown in the shape of a pyramid coming to a point on crown of the 

 head; hairs on cheeks and sides of head long, stiff, very dense, rising 

 upwards in enormous tufts above head, yellowish white at base 

 grading into buffy at tips; hind neck and mantle pale reddish brown, 

 hairs with a band of white succeeded by a subterminal one of black 

 and tip silvery white ; towards the lower back the color darkens into a 

 cinnamon banded with lighter cinnamon, and tipped with the same ; 

 upper part of rump ochraceous buff paler than the mantle; lower rump 

 and base of tail silvery white ; sides of jaw with hairs long and dense, 

 yellowish white; throat more sparsely covered with hairs of the same 

 color; chest dark gray, hairs banded with black, and white tips; 

 abdomen ochraceous, arms and hands like forehead, grizzled, hairs 

 banded with black and white; tail grizzled russet and white, tuft 

 russet. Ex type British Museum. 



Measurements. Total length, 1,322; tail, 572; foot, 188; ear, 59, 

 (Collector). Skull: total length, 180.4; occipito-nasal length, 147.9; 

 Hensel, 125.7; intertemporal width, 56.6; width of braincase, 80; 

 length of rostrum, 91.2; width of rostrum posteriorly, 46.6; zygomatic 

 width, 119.7; palatal length, 76.8; median length of nasals, 52.1 : length 

 of upper molar series, 44.6 ; size of last upper molar crown, 10 x 8.5 ; 

 length of mandible, 136.1 ; length of lower molar series, 57; size of last 

 lower molar crown, 13.5 x 8.5. Ex type British Museum. 



The type is a very fine specimen of an adult male. As shown by 

 the description it differs in every way from the Abyssinian Hamadryas 

 and also from the Arabian, as the affinities of the latter seem to be 

 altogether with the Abyssinian animal and not with the present species. 

 The light reddish mantle, and parti-colored rump of ochraceous buff 

 and silvery white, cause it to be very conspicuous when placed among 

 examples of the Hamadryas baboon. The type was procured by Mr. D. 

 Drake-Brockman after whom I had much pleasure in naming it. I 

 ■ saw this apparently same species frequently in Durban, Somaliland, 

 and it was the only species of baboon inhabiting the country until the 

 valley of the Shebeyleh is reached. It lives among the rocks, and it is 

 seldom that an individual is found far from some rocky ledge to 



