234 PAN 



from the recognized forms. In East Africa, in the Niam-niam coun- 

 try, and from Albert Nyanza to Tanganyika on the west, going into the 

 Congo forest but limits unknown are P. schweinfurthi and P. s. 



MARUNGENSIS. 



KEY TO THE SPECIES AND SUBSPECIES. 



A. Pelage all black. 



o. Hair moderately long. 



a.' Forehead entirely bald to level of ears P. calvus. 



b.' Forehead partly bald P. fuliginosus. 



c' Forehead bald but not to level of ears P. satyrus. 



d.' Forehead mostly covered with hair. 



a." Face black, ears large P. kooloo-kamba. 



b." Face all flesh color P. leucoprymnus. 



c." Region around eyes darker than 



face P. chimpanse. 



b. Hair very long P. schweinfurthi. 



B. Pelage not all black. 



a. Lower back grayish brown P. s. marungensis. 



b. Lower back Prout's brown P. aubryi. 



C. Pelage mostly brown in alults. 



a. Forehead and top of head bald P. vellerosus. 



b. Forehead not bald, hair on head springing 



from a central whorl P. fuscus. 



Pan calvus (Du Chaillu). 



Troglodytes calvus Du Chaillu, Proc. Best. Soc. Nat. Hist., VH, 

 1860, p. 296; Id. Equat. Afr., 1861, p. 407, pi; Gray. Proc. 

 Zool. Soc. Lond., 1861, p. 273; Bartl., Proc. Zool. Soc. Lond., 

 1885, p. 672, pi. XLI ; Beddard, Proc. Zool. Soc. Lond., 1892, 

 p. 118; Id. Trans. Zool. Soc. Lond., XIH, 1893, p. 177, pis. 



xx-xxvni. 



Pseudanthropus calvus Reichenb., Vollstand. Naturg. Aflfen, 1862, 



p. 194. 

 Mimetes troglodytes var. a. calvus Gray, Cat. Monkeys, Lemurs 



and Fruit-eating Bats, Brit. Mus., 1870, p. 6. 

 Anthropithecus calvus Romanes, Proc. Zool. Soc. Lond., 1889, 



p. 316; Flower and Lydekk., Mamm. Liv. and Ext., 1891, p. 



735 ; Forbes, Handb. Primates, H, 1894, p. 199, pi. XXIX. 



