18 ERYTHROCEBUS 



molar series, 28 ; length of mandible, 76.5 ; length of lower molar series, 

 28. Ex type Berlin Museum. 



This form is peculiar in not having any black on head, the usual 

 black stripes seen on E. patas and its allies being absent. It is also of 

 a paler color on head, limbs and flanks, the dorsal region, however, 

 being of the same hue as that of E. langeldi. 



