140 



APES, MONKEYS, AND LEMURS 



THE DRILL ( Cynocephalus leucophceus) 



Although described by Frederic Cuvier as far back as the year 1807 as a dis- 

 tinct species, the West African baboon represented in the accompanying figure, 

 and known as the drill had for many years previously, in spite of a figure given 

 by the traveler, T. Pennant, been considered to be merely the young of the 

 mandrill, which had not acquired the characteristic coloration of the face. The 



THE DRILL. 

 (One-sixteenth natural size.) 



acquisition of adult specimens of the drill by our museums and menageries proved, 

 however, the correctness of the English and French naturalists' determination. 

 It is exclusively West African, but its range in latitude appears to be somewhat 

 more extensive than that of the mandrill. 



It may be distinguished from its larger cousin the mandrill by the absence of 

 any bright colors on the naked parts of the face, which are entirely black. The 



