10 ERYTHROCEBUS 
of upper molar series, 32; length of mandible, 106; length of lower 
molar series, 41. Ex Hemprich et Ehrenberg’s type in Berlin Museum. 
ERYTHROCEBUS FoRMOSUS Elliot. 
Erythrocebus formosus Elliot, Ann. Mag. Nat. Hist., IV, 8th Ser., 
1909, p. 264. | 
Type locality. Uganda, particular locality not known. Type in 
British Museum. Pe 
Genl. Char. Similar to E. pyrrnonotus, but with a much darker 
rump and tail, more black on shoulders, and under parts of body buff 
pink, instead of grayish white, with a pale yellow line down center of 
belly. ) | 
Color. Head, face and cheeks like E. pyrruonotus, with white 
patch on end of nose; the black brow line is not distinct between eye 
‘ and ear, and turns up over the crown from corners of the eyes as in 
the allied form; top of head fox red; head above ear, nape, hind neck 
and shoulders ochraceous buff, hairs yellow tipped ; lower back to rump 
and flanks pinkish, hairs tipped with yellow, this last giving a yellow 
effect to all the upper parts; rump vinaceous rufous grading into bay at 
tail and hips; sides of neck and chest lemon yellow, some hairs tipped 
with black; outer side of arms lemon yellow; inner side of arms and 
hands white; under parts of body buff pink with a yellow line down 
center of belly ; chin, throat and center of chest white, this hue narrow- 
ing to a point on lower part of chest as it is encroached upon by the 
lemon yellow color on each side; outer side of thighs in front to knees 
like rump, on sides pale yellow; below knees the legs and feet are 
white; inner side of thighs and legs grayish white; tail bay, slightly 
paler at tip. Ex type British Museum. 
Measurements. Total length, 1,410; tail, 740; foot, 145, (skin). 
Ex type British Museum. 
This is a large species resembling E. pyrRHONOTUS on upper parts 
except on rump which with the tail is much darker, in fact quite a 
different color; the thighs are also unlike those of E. pyRRHONOTUS, 
and the under parts have the sides of neck, chest and arms lemon 
yellow quite different from the gray chest and yellowish white arms of 
the allied species, and the under parts of the body are altogether 
different, of a color difficult to describe, but which I have called 
buff pink. Unfortunately there is no skull. 
The only species of EryTHrocEesus dwelling near this one, is 
