COLOBUS 115 
GENUS V. COLOBUS. THE GUEREZAS. 
Lis; Ci; Pi; M. ==32. 
COLOBUS Iilig., Prodr. Syst. Mamm. et Avium, 1811, p. 69. Type 
Simia 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. Sénégamb., Suppl. Vert., Prem. fasc., 
1886-87, pp. 95, 97-102, pl. I. 
Tropicolobus Rochebr., Faun. Sénégamb., Suppl. Vert., Prem. 
fasc., 1886-87, p. 102, pls. II, XXVIII. 
Piliocolobus Rochebr., Faun. Sénégamb., Suppl. Vert., Prem. fasc., 
1886-87, p. 105, pls. III-VI. : | 
Stachycolobus Rochebr., Faun. Sénégamb., Suppl. Vert., Prem. 
fasc., 1886-87, p. 114, pl. VII. | 
Pterycolobus Rochebr., Faun. Sénégamb., Suppl. Vert., Prem. 
fasc., 1886-87, p. 125, pl. X. 
Lophocolobus Pousarg., Bull. Mus. Hist. Nat., Paris, III, 1895, p. 
98. 
Thumb 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. Vermiform 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 affords a striking 
