44 BULLETIN 99, UNITED STATES NATIONAL MUSEUM. 
Authors are quite generally agreed that the occidentalis-like colobus 
monkeys from the lake region of Central Africa, are scarcely dis- 
tinguishable from the typical form of the Congo Valley,’ although 
several subspecies have been described from extreme eastern Congo. 
Only a single skin, without skull, of occidentalis from the Congo 
Valley is in the National Museum collection, and I am therefore 
unable to make satisfactory comparisons. 
Descriptions of new forms of Colobus are often of little use in 
identifying specimens, as they frequently have been based on unre- 
‘liable characters, especially on such a variable feature as the tuft of 
the tail. Names to be considered in connection with the Budonga 
Forest form, if it is not true occidentalis, are Colobus (Guereza) 
matschiei uellensis Matschie,? described from Uelle, Belgian Congo; 
Colobus (Guereza) matschiei ituricus Matschie,? from Ituri, Belgian 
Congo; Colobus (Guereza) matschiei diane Matschie,* from Kissenge, 
on the northeast shore of Lake Albert Edward; Colobus (Guereza) 
matschiei dodinge Matschie,® from southwestern Dodinga Mountains, 
Uganda; and Colobus occidentalis rutschuricus Lorenz,® from Sassa 
River, on the northeastern edge of the Rutschuru Plains, southeast 
of Lake Albert Edward. 1 
COLOBUS OCCIDENTALIS TERRESTRIS Heller. 
Plate 17. 
1910. Colobus palliatus cottoni RoosEvetr, African Game Trails, Amer. ed., p. 
474; London ed., p. 486. (Not Colobus cottoni Lydekker. ) 
1913. Colobus abyssinicus terrestris HELLER, Smithsonian Misc. Coll., vol. 61, No. 
17, p. 7. October 21. (Rhino Camp, Lado Enclave; type in U.S. Nat. 
Mus.) 
1913. Colobus (Guereza) matschiei brachychaites Marscure, Ann. Soc. Roy. Zool. 
Malac. Belgique, vol. 47 (1912), p. 53. December. (Modi, between 
Kaya and Dufile, Lado Enclave; type in collection of Maj. Powell- 
Cotton, Quex Park, Birchington, England.) 
Specimen.—One, from— 
Lavo: Rhino Camp (K. Roosevelt). 
Small troupes of this race were seen by Kermit Roosevelt near the banks of the 
Nile, but were not observed by other members of the expedition. They were found 
in small scattered acacia trees which they deserted when hard pressed and ran across 
country to the nearest grove in the manner of baboons. The Colobus monkeys of 
the highlands of East Africa have quite different habits and live in dense forests 
where they move about through the trees by leaping from one branch to another and 
1 Elliot, Rev. Primates, vol. 3, pp. 144-145, 1913; Loénnberg, Kungl. Svenska Vet.-Akad. Hand., vol. 58, 
No. 2, pp. 27-28, 1917; Lénnberg, Revue Zool. Africaine, vol. 7, pp. 117-118, 1919. 
2 Ann. Soc. Roy. Zool. Malac. Belgique, vol. 47 (1912), p. 47. December, 1913. 
3 Ann. Soc. Roy. Zool. Malac. Belgique, vol. 47 (1912), p. 48. December, 1915. 
4 Ann. Soc. Roy. Zool. Malac. Belgique, vol. 47 (1912), p. 49. December, 1913. 
5 Ann. Soc. Roy. Zool. Malac. Belgique, vol. 47 (1912), p. 52. December, 1913. 
6 Anz. K. Akad. Wiss. Wien, vol. 51, p. 508. 1914. 
