8 AOTUS 



It is, therefore, undeterminable and the name should be dropped 

 from the list. That the examples belonged to the present genus and 

 not to Chirogale is quite evident, the head markings alone being quite 

 sufficient to establish this fact. 



AoTus NiGEiCEPS Dollman. 



Aotus nigriceps Dollman, Ann. Mag. Nat. Hist., LV, 8th Ser., 

 1909, p. 200. 



Type locality. Chanchamayo, Peru. Type in British Museum. 



Genl. Char. Black stripes on head ; broad lateral ones uniting 

 with central stripe on occiput ; hands and feet dark ; tooth rows curved ; 

 first and second molars nearly equal and largest ; orbits large. 



Color. A spot over each eye extending backward and curving 

 inward in a narrow line and almost meeting at occiput, white; hairs 

 on side of upper lip, white ; line from cheeks extending over sides of 

 head and broadening as it goes, joining a central line from forehead 

 between eyes and passing over the crown, black ; the junction of these 

 three lines causes the occiput also to be black ; sides of head, entire 

 upper parts of body and outer side of limbs grizzled iron gray, darkest 

 on dorsal line from middle of back where the hairs are tipped with 

 reddish brown ; hands and feet blackish brown ; chin blackish ; throat 

 and entire under parts of body, and inner side of limbs, ochraceous 

 buflF; tail above at base, hairs orange buff with black, grading into 

 buff yellow with black tips, and then becoming all black on apical 

 fourth ; beneath deep orange at base of hairs, grading into orange buff 

 with black tips, and then all black. Ex type British Museum. 



Measurements. Total length, 740; tail, 400; foot, 90. Skull: 

 total length, 63.4; occipito-nasal length, 58; intertemporal width, 31.5; 

 width of braincase, 33.7; Hensel, 41.7; zygomatic width, 39; median 

 length of nasals, 96 ; palatal length, 18 ; length of upper molar series, 

 15 ; length of mandible, 37.5 ; length of lower molar series, 16. Ex 

 type British Museum. 



This species differs from all others in its black head and white 

 stripes, and dark hands and feet. A large series is in the British 

 Museum from Chanchamayo. 



Aotus senex Dollman. 



Aotus senex Dollman, Ann. Mag. Nat. Hist., IV, 8th Ser., 1900, 



p. 200. 

 Type locality. Pozuzo, Peru. Type in British Museum. 



