EAST AFRICAN MAMMALS IN NATIONAL MUSEUM. 45 
descend to the ground rarely to escape an enemy. They are not known to inhabit 
acacia trees.} 
COLOBUS OCCIDENTALIS MATSCHIEI Neumann. 
‘1899. Colobus matschiei NEUMANN, Sitz.-ber. Ges. nat. Freunde Berlin, p. 15. 
January. (Kwa Kitoto, Ugowe Bay, Victoria Nyanza, Kavirondo, 
British East Africa; type in Berlin Museum.) 
1913. Colobus abyssinicus matschici Heiter, Smithsonian Misc. Coll., vol. 61, 
No. 17, p. 5. October 21. 
Specimens.—Seven, including two flat skins, from— 
British East Arrica: Lukosa River, Kisumu, 7 (Heller). 
COLOBUS OCCIDENTALIS ROOSEVELTI Heller. 
Plate 18. 
1910, Colobus abyssinicus matschiei Roosevett, African Game Trails, Amer. ed., 
p. 474; London ed., p. 486. (Not of Neumann.) 
1913. Colobus abyssinicus roosevelti HELLER, Smithsonian Misc. Coll., vol. 61, 
No. 17, p. 5. October 21. (Mau Forest, near Enjoro, British East 
Africa; type in U. S. National Museum.) 
Specimens.— Five, as follows: 
British East Arrica: Enjoro, 5 (T. Roosevelt). 
This form is very closely related to Colobus occidentalis matschiei of 
Kavirondo. In color there is very little difference between the two 
subspecies, but the light markings of all the specimens of matschiet 
are yellowish-white, with a distinct greenish cast, while the white 
markings of roosevelti are buffy-white, more mixed with gray. These 
differences are especially marked on the light areas on the head and 
throat. As noted by Heller, the skulls of old males of roosevelti 
develop a sharp sagittal crest, while those of matschier do not. 
1 Heller, Smithsonian Misc. Coll., vol. 61, No. 17, p.7. October 21, 1913, 
