16 ; ERYTHROCEBUS 
Type locality. Go, Lake Chad. Type in British Museum. 
Color. Face brownish black, paler about eyes; a narrow line along 
ridge of the nose, broadening out and forming a large patch on the 
end, black; band across brow, and extending over temples to ears, but 
not branching upwards to crown, black; top and back of head rufous, 
speckled with black on outer edge; neck and upper back extending 
over shoulders, hairs pinkish buff annulated with cream buff, and 
tipped with black; rest of upper parts dark orange buff, hairs annu- 
lated with white on dorsal line and lower back, but not on rump, the 
tips are black, the annulations, however, are more conspicuous than 
the black tips, and give a frosted appearance to the upper parts; rump 
rather deeper in color than back, and without annulations towards 
root of tail; flanks like upper parts; hairs below eyes on upper part 
of cheeks, mixed black and white; whiskers long, extending beneath 
and beyond ears, grayish white becoming cream buff at end of hairs; 
sides of neck cream buff; lips, chin, throat, chest, narrow line down 
middle of belly, forearms, hands, legs and feet, white; arms above 
elbows on outer side covered with long black and white hairs, the black 
predominating towards the shoulders; sides of belly buff; tail above 
ochraceous rufous at base, growing paler towards the tip which is cream 
buff ; beneath white, tinged with buff at tip. Ex type British Museum. 
Measurements. Total length, 1,350; tail, 720; foot, 172, (taken 
in the flesh). Skull: total length, 143; occipito-nasal length, 127.5; 
intertemporal width, 47.3; Hensel, 98.2; zygomatic width, 88.5; width 
of braincase, 63.2; median length of nasals, 24.8; palatal length, 49; 
length of upper molar series, 29.8; length of upper canines, 28.5; length 
of mandible, 99.3; length of lower molar series, 38.4. Ex type British 
Museum. 
This form seems to be entitled to a distinct specific rank instead 
of being regarded as a subspecies of E. patas. Indeed it may be said 
to belong to a different group from that which E. patas represents, 
that one having the legs from thighs downward pure white. The 
type is a large, fully adult male. It differs materially from PaTas in 
its grayish black shoulders instead of pale yellow, in its white thighs 
and in the paler upper parts of body. 
ERYTHROCEBUS CIRCUMCINCTUS Reichenbach. 
Cercopithecus circumcinctus Reich., Vollstand. Naturg. Affen, 
1862, p. 123, pl. XXI, fig. 310; Pocock, Proc. Zool. Soc. Lond., 
II, 1907, p. 745. 
Type locality. Unknown. “West Africa.” 
