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. 3 
KEY TO THE SPECIES AND SUBSPECIES. 
A. Pelage all black. 
a. Hair moderately long. 
a. Forehead entirely bald to level of ears........ P. calvus. 
b."’’ Forehead partly pale Tle PRLS PRE P. fuliginosus. 
c. Forehead bald but not to level of ears........ P. satyrus. 
d.. Forehead mostly covered with hair. 
a.” Face’ black, ears ‘large’... 202... P. kooloo-kamba. 
, b." * Fgee'all flesh dolor 2S Ute, CS P. leucoprymnus. 
c.” Region around eyes darker than 
BAC OE a). Pe A TE P. chimpanse. 
b. Hairwery dong ere) Sy 9 a, es P. schwewmfurthi. 
B. Pelage not all black. 
a. Lower back grayish brown ............... P. s. marungensis. 
b. Lower tatk "Proat's brawtr: 8 sre See: ee ae P. aubryt. 
C. Pelage mostly brown in alults. 
a.’ Forehead and ‘top of head Gala en er ee P. vellerosus. 
b. Forehead not bald, hair on head springing 
trom’ a central wien 7.2 Scot ee ee eee P. fuscus. 
Pawn catvus (Du Chaillu). 
Troglodytes calvus Du Chaillu, Proc. Bost. Soc. Nat. Hist., VII, 
1860, p. 296; Jd. Equat. Afr., 1861, p. 407, pl.; Gray. Proc. 
Zool. Soc. Lond., 1861, p. 273; Bartl., Proc. Zool. Soc. Lond., 
1885, p. 673, pl. XLI; Beddard, Proc. Zool. Soc. Lond., 1892, 
p. 118; Id. Trans. Zool. Soc. Lond., XIII, 1893, p. 177, pls. 
XX-XXVIII. 
Pseudanthropus calvus Reichenb., Vollstand. Naturg. Affen, 1862, 
p. 194. 
Mimetes troglodytes var. a. caluus Gray, Cat. Monkeys, Lemurs 
and Fruit-eating Bats, Brit. Mus., 1870, p. 6. 
Anthropithecus caluus Romanes, Proc. Zool. Soc. Lond., 1889, 
p. 316; Flower and Lydekk., Mamm. Liv. and Ext., 1891, p. 
735; Forbes, Handb. Primates, II, 1894, p. 199, pl. XXIX. 
