10 AOTUS 



dorsal region ; under parts yellowish gray ; inner side of limbs gray ; 

 hands and feet reddish brown ; tail, basal half reddish brown, remain- 

 der reddish black. Ex type British Museum. 



Measurements. Total length, 698; tail, 280. Skull: occipito- 

 nasal length, 52; Hensel, 40; zygomatic width, 39; intertemporal 

 width, 32; palatal length, 18; width of braincase, 32; median length 

 of nasals, 10; length of upper molar series, 13. Ex type British 

 Museum. 



This species differs from all the rest in its reddish brown hands 

 and feet. The stripes on the head are indistinct when compared with 

 other species, and are very narrow. Doubtfully from Nicaragua. 



AoTus EOBERTi Dollman. 



Aottis roberti Dollman, Ann. Mag. Nat. Hist., IV, 8th Ser., 1909, 

 p. 199. 



ROBERTS DOVROVCOULI. 



Type locality. Matto Grosso, Brazil. Type in British Museum. 



Color. Face black; whitish spot over eyes, between which is a 

 fan-shaped black mark ; brownish black line from corner of eye extends 

 upwards on outer side of the white spot, and then outward and termi- 

 nates on side of the crown ; occiput, entire upper parts of body, 

 grizzled buflfy gray, the hairs being banded with buff and black and 

 tipped with white; dorsal line from middle of back, and rump have a 

 reddish tinge ; upper lip and chin covered with short white hairs ; entire 

 under parts and inner side of limbs ochraceous buff; hands and feet 

 reddish brown ; tail above at base orange red, remainder black, beneath 

 red grading into golden on basal half, rest black. Ex type British 

 Museum. 



Measurements. Total length, 640; tail, 260; foot, 85. Skull: 

 total length, 64; occipito-nasal length, 57.6; intertemporal width, 31.7; 

 breadth of braincase, 33 ; Hensel, 39 ; zygomatic width, 40.5 ; median 

 length of nasals, 12.8; palatal length, 17; length of upper molar series, 

 15. Ex type British Museum. 



The type in the British Museum differs chiefly in its yellowish 

 gray color, and in having the lateral stripes on the head not encircling 

 the white spots above the eyes, but continuing backwards on side of 

 crown and terminating above the ears. 



AoTus MiKiQUOuiNA (E. Geoffrov) . 



Pithecia miriquouina E. Geoff., Ann. Mus. Hist. Nat. Paris, 

 XIX, 1812, p. 117; Kuhl, Beitr. Zool., 1823, p. 43. 



