ERYTHROCEBUS 11 
E. BAUMSTARKI from Masailand, but as that animal has no black 
on brow or head it cannot be compared with the present one. 
ERYTHROCEBUS POLIOPHZUS (Reichenbach). 
Cercopithecus poliopheus Reichenb., Vollstand. Naturg. Affen, 
1862, p. 122, fig. 309; Heugl., Faun. d. Roth Meeres, p. 13; 
Pocock, Proc. Zool. Soc. Lond., II, 1907, p. 745. 
Type locality. Fagzohl, Blue Nile, on border of Western Abys- 
sinia. 
Genl. Char. Shoulders mostly black, chin white. 
Geogr. Distr. Abyssinia, Bahr el Ghazal. 
Color. Face black; two black stripes from eye to ear, and a 
branch to top of head; crown of head fox red, and back of neck 
bright reddish brown; upper part and sides of body dark reddish, hairs 
tipped with white; cheeks, sides of head, throat, breast and inner 
side of limbs white; under parts yellowish white; shoulders and outer 
side of arms to elbows black; forearms white, speckled; hands white; 
thighs on outer side deep red; legs below knees, and feet, white; upper 
part of tail dark purple red, beneath white; ears black; hairs on upper 
lip white. Size about same as E. pyrRHONOTUS. Head and body, 620; 
tail, 680; foot, 175. Ex specimen Vienna Museum, obtained by 
Heuglin. White Nile. 
Measurements. Skull: total length, 122.1; occipito-nasal length, 
106.6; intertemporal width, 50; Hensel, 82.3; zygomatic width, 75.3; 
width of braincase, 69.3; median length of nasals, 27; palatal length, 
38.6; length of upper molar series, 31.6; length of mandible, 81.4; 
length of lower molar series, 37.1. 
This species resembles E. pyRRHONOTUS, but differs in being of a 
darker red color, and in having black shoulders. 
It will readily be seen on comparison that the proportions between 
the skull of this species and that of E. aLBIcENIs are altogether differ- 
ent, this one being much shorter and broader, in fact of an altogether 
different shape. The black and white forearms, speckled rump, and 
black band from eye to ear will cause E. potiopHzus to be easily 
recognized from its near relatives. 
ERYTHROCEBUS WHITEI Hollister. 
Erythrocebus whitei Hollister, Smith. Misc. Coll., 56, No. 2, 1910, 
p. 11. 
Type locality. Nzoia River, Guas Ngishu Plateau, British East 
Africa. Type in United States National Museum. 
