THE DRILL BABOON 3 



brilliant carmine, which imparts a ferociously savage 

 appearance to the already hideous physiognomy : 

 chin white. Iris hazel. Ears purplish brown, and 

 the fur immediately behind them white. General 

 colour of the pelage greenish grey (not brown as has 

 been erroneously stated) ; a dull black dorsal line 

 extends from occiput to pelvis. 1 Buttocks crimson 

 lake, shading into purplish lilac externally. 



Young drill differ from adults in lacking the 

 swellings on the cheeks, the carmine on the lower 

 lip, and the vivid coloration of the buttock. An 

 immature male examined by the writer on January 

 12, 1906, had the general hue of the fur dull blackish 

 brown, though the green tinge of maturity had 

 already begun to appear on the outside of the 

 forelimbs. 1 The face was black and glossy, shining 

 like leather, and each cheek was slightly inflated; 

 the lower lip was black, and a salmon-coloured area 

 on the lower jaw heralded the carmine of maturity; 

 the chin was greenish grey. The abdomen was but 

 thinly haired, showing the bluish skin underneath; 

 the toes and nails of all four limbs were purplish 

 black. The drill in its immature stages is of special 

 interest, on account of its close resemblance to the 

 young of the yet more hideous mandrill. 



The mandrill (Papio mormon) perhaps the hog 

 ape or chceropithecus of Aristotle is the largest of 



1. The green hue of the fur in monkeys is produced by a mixture of 

 golden yellow and black rings on the individual hairs, much as a greenish 

 powder is obtained by mixing sulphur with iron filings. 



