18 ACTUS 



full grown and shows no signs of immaturity, and with its decided head 

 markings, an entirely different color, it seems hardly correct to unite 

 it with A. INFULATUS. As is usual with the types of species of the 

 earlier authors, no locality beyond "Haute Amazone, Perou," is given 

 with the specimens. The type was obtained by Castelnau and Deville 

 in their expedition to South America and was figured in the Atlas of 

 their published work. 



AoTus GULAKis Dollman. 



Aotus gularis Dollman, Ann. Mag. Nat. Hist., IV, 8th Ser., 1909, 

 p. 201. 



Type locality. Mouth of Rio Chocho on Upper Rio Napo, 

 Ecuador. Type in British Museum. 



Color. Three heavy black lines, one from the corner of each eye 

 and one from above the nose, all meeting on the occiput ; buffy white 

 spot above each eye, grading into russet, extending backward to 

 occiput ; sides of head and neck, and flanks, brownish gray ; dorsal 

 line mars brown, hairs purplish on basal half, and banded with mars 

 brown and black ; outer side of arms dark brownish gray ; outer side 

 of legs like flanks ; chin, throat and chest gray ; under parts of body, 

 and inner side of legs buff ; hands and feet black ; tail at base above 

 and beneath orange, remainder to tip black. Ex type British Museum. 



Measurements. Total length, 690 ; tail, 350 ; foot, 20. Skull : total 

 length, 63.4 ; occipito-nasal length, 59.3 ; intertemporal width, 34 ; 

 breadth of braincase, 33 ; Hensel, 40 ; zygomatic width, 40 ; median 

 length of nasals, 12; palatal length, 16; length of upper molar series, 

 15; length of mandible, 37.6; length of lower molar series, 16.4. Ex 

 type British Museum. 



This animal differs from A. microdon from Macas, in its gray 

 body and the jet black stripes on the head, and from A. nigriceps in the 

 russet portion of the crown stripe, and in the mars brown of the dorsal 

 region, and brownish gray flanks. The molar series of teeth are 

 smaller. 



Aotus microdon Dollman. 



Aotus microdon Dollman, Ann. Mag. Nat. Hist., I\', 8th Ser., 



1909, p. 203. 

 Type locality. Macas, Ecuador. 



