Baboon from East Africa. 47 



Papio tliotli iheanus, subsp. n. 



Fur remarkably coarse and shaggy all over the body, and 

 even longer than in P. t. tyvicus. Colour a coarse mixture 

 of blackish and dull fawny white, without any of the brigliter 

 yellow always present in the typical form, at least on the head 

 and limbs. Hairs on the crown of the head broadly annulated 

 with black, this part being nearly uniform yellow in the true 

 thoth. Colour of outer side of limbs quite like back, the 

 hairs slaty grey basally, ringed terminally with black and 

 dull fawny white. Chin and throat well-haired, whitish, at 

 first, anteriorly, unannulated, but gradually proceeding back- 

 wards blackish rings make their appearance, and on the chest 

 all the hairs are broadly annulated with black and white and 

 on the belly with black and dull fawn. Inner sides of fore 

 limbs like chest, but inner sides of hind ones a clearer and 

 less annulated fawn-colour. Upper surfaces of both hands 

 and feet like the outer surfaces of arms and legs, not getting 

 darker terminally. 



Skull. — Owing to the fact that the typical and only avail- 

 able adult male skull of P. thoth is obviously deteriorated by 

 captivity, it would be useless to enter into a detailed com- 

 parison between the two skulls ; but, comparing the East- 

 African skull with a fine Angolan skull of what I take to be 

 P. aniibis, it is characterized by its much less salient facial 

 ridges, shorter and broader palate, markedly smaller and 

 narrower foramen magnum, and higher and more vertically 

 directed mandibular coronoid processes. 



Dimensions of the type (an adult male skin) : — 



Head and body (c.) 850 millim. ; tail (c.) 610; hind 

 foot 182. 



Skull : basal length 151 ; greatest length, exclusive of 

 occipital crest, 195 ; greatest breadth 114; gnathion to lower 

 edge of orbit 111 ; nasals, length mesially 64, laterally 68, 

 greatest breadth 15; height of orbit 25*5; breadth across 

 orbits outside at fronto-malar sutures 84 ; nasion to occiput, 

 exclusive of crest, 99 ; palate, length 97, breadth between 

 outer sides of ^i^ 56*5, between inner sides of ^J^ 33 ; com- 

 bined lengths of upper true molars 37. 



Ilab. Lamu, East Africa. 



Of other species of the genus besides P. thoth none of tlie 

 present group are known from East Africa at all, P. porcarius 

 being South African and P. anubis and P. sphinx being 

 West African. 



