COLO BUS lis 



GENUS V. COLOBUS. THE GUEREZAS. 



COLOBUS Illig., Prodr. Syst. Mamm. et Avium, 1811, p. 69. Type 



Simla polycomus Schreber. 

 Colobolus Gray, Lond. Med. Repos., XV, 1821, p. 108. 

 Guereza Gray, Cat. Monkeys, Lemurs and Fruit-eating Bats, Brit. 



Mus., 1870, pp. 5, 19. 

 Procolobus Rochebr., Faun. Senegamb., Suppl. Vert., Prem. fasc, 



1886-87, pp. 95, 97-102, pi. I. 

 Tropicolobus Rochebr., Faun. Senegamb., Suppl. Vert., Prem. 



fasc, 1886-87, p. 102, pis. II, XXVIII. 

 Piliocolobus Rochebr., Faun. Senegamb., Suppl. \'ert., Prem. fasc., 



1886-87, p. 105, pis. III-VI. 

 Stachycolobus Rochebr., Faun. Senegamb., Suppl. Vert., Prem. 



fasc, 1886-87, p. 114. pi. VII. 

 Pterycolobus Rochebr., Faun. Senegamb., Suppl. \'ert., Prem. 



fasc, 1886-87, p. 125, pi. X. 

 Lophocolobus Pousarg., Bull. Mus. Hist. Nat., Paris, III, 1895, p. 



98. 



Thimib nearly obsolete ; body slender ; ear rounded, naked, some- 

 times tufted internally ; callosities large ; tail long, frequently tufted ; 

 hairs on sides of body long, hanging like a fringe. 



Skull : braincase large ; muzzle short ; lower posterior molar with 

 five cusps ; cheek pouches very small, nostrils widely separated ; face 

 covered by short, soft hairs, downy in texture. The brain has the cere- 

 bellum concealed by the cerebrum ; and there is a hippocampus minor 

 present. \'ermiform appendix absent. Stomach elongate, with several 

 pouches; muzzle short; callosities small. Os centralis in wrist present. 



The Guerezas can be divided into two groups, which may be 

 designated the Red and Black Guerezas. They are conspicuously 

 separated from the Langurs by the practical absence of the thumb. 

 They are large monkeys with exceedingly long tails, which are heavily 

 tufted in the black members, in some species with enormous brushes, 

 and as a rule they are handsome animals, and the long flowing white 

 hair which decorates the coats of the black members aflfords a striking 



