1868.] DR. J. E. GRAY ON A NEW COLOBUS. 181 



varieties of that species. The long hair of the head shows its alliance 

 to C. vellerosus. 



The species of the genus may be thus defined : — 



1. CoLOBUs SATANAS, Waterhouse. 



Crown crested; whiskers elongated, expanded. Black; hairs long 

 and coarse, of crown and sides of face elongated, crisp, forming a 

 wide, high-spreading crest, with the tips recurved forwards. 



Fernando Po. B.M. 



2. CoLOBUS POLYCOMUs, GeofiV. 



Crown of head and sides of face and throat with elongated hairs, 

 forming a mane ; tail-end slightly tufted. Black ; forehead, circum- 

 ference of face, and mane whitish ; tail white. B.M. 



Var. ursinus, Ogilby. Tail all white ; mane greyish. 



Fernando Po. B.M. 



3. CoLOBUs ANGOLENSis, Sclater, P. Z. S. 1860, p. 245. 



Crown of head, the sides of face, and throat with elongated hairs, 

 forming a mane ; tail-end slightly tufted. Black ; sides of mane and 

 end of tail white. 



Angola. B.M. 



4. CoLOBUS BicoLOR, Wesmacl. 



Crown of the head with reflexed hair ; hair of forehead, sides of 

 face, and chin long, expanded. Black, shining, silky ; hair of forehead 

 and side of face and chin white ; tail white ; haunches grey. 



West Coast of Africa. B.M. 



5. COLOBUS KIRKII. 



Crown of head with reflexed hair, rather radiating in front of fore- 

 head ; circumference of face and chin smooth, baldish. Back and 

 tail red brown ; nape, feet, outside of arms, and thighs black ; forehead, 

 cheeks, underside and inner side of limbs whitish. 



Zanzibar. B.M. 



6. COLOBUS FERRUGINEUS, Kuhl. 



Crown of head with reflexed hair, rather radiating in front of the 

 forehead ; circumference of face and chin smooth. Blackish grev ; 

 sides of neck, cheek, throat, forehead, legs, and feet red-bay ; nape 

 and base of tail above reddish. 



Gambia. B.M. 



Van 1. rufoniger, Martin. The black and red more intense 

 and bright ; tail black, red near the base. B.M. 



Var. 2. pennantii, Waterhouse. Like rvfoniger, but feet and 

 tail blacker ; nape not red. 



Gambia. B.M. 



In this species the thumb varies in development ; it sometimes 

 has a claw. 



