AOTUS 11 



Simia (Pithecia) azarce Humb., Obs. Zool., 1811, (1815), p. 359. 

 Nyctipithecus azarce Schleg., Mus. Pays-Bas, Simiae, 1876, p. 212, 



(nee Synon) ; von Pelz., Kaiserl. Konigl. Zool.-botanisch. 



Gesel. Wien, 1883, XXXIII, p. 18; Forbes, Handb. Primates, 



I, 1894, p. 170. 

 Nyctipithecus trivirgatus Rengg., Naturg. Saugth. Paraguay, 



1830, p. 58, (nee Humb.). 

 Aotus azarcE Thos., Proc. Zool. Soc. Lond., 1903, p. 234. 



AZARA'S DOUROUCOULI. 



Type locality. Right bank of the River Paraguay, north-eastern 

 part of the Argentine Republic. 



Geogr. Distr. Argentine Republic. 



Genl. Char. Large black patch between the superciliary spots. 



Color. A white spot over each eye, extending backward in a 

 narrow line to crown, and separating the central black spot from the 

 black lateral lines, which extend from the angles of the mouth to the 

 crown on each side of the head; entire upper parts iron gray, outer 

 side of limbs iron gray like upper parts; under parts and inner side 

 of limbs ochraceous buff; hands reddish brown, feet washed with 

 gray ; tail at base ochraceous rufous, hairs black tipped, remainder 

 black. 



Measurements. Skull : occipito-nasal length, 57 : zygomatic width, 

 40.8; intertemporal width, 31.2; palatal length, 14.5; breadth of brain- 

 case, 35; median length of nasals, 11.7; length of upper molar series, 

 13.3 ; length of mandible, 40 ; length of lower molar series, 15.3. 



Aotus boliviensis Elliot. 



Aotus boliviensis Elliot, Ann. Mag. Nat. Hist., XX, 1907, 7th Ser., 

 p. 189. 



Type locality. Province of Sara, Central Bolivia. Type in British 

 Museum. 



Genl. Char. Similar in color to A. miriquouina, but black on 

 occiput and the cranial characters different. Orbits wider and higher ; 

 orbital portion of frontal bulging outward forming a decided curve 

 from the frontal to the nasals ; the nasals are longer and wider ; 

 braincase longer and narrower posteriorly ; extreme width across 

 orbits much greater ; interior outline of skull much less curved ; angle 

 of occipital region much less ; teeth larger, particularly the last upper 

 molar ; space from posterior edge of foramen magnum to interparietal 

 much greater ; basioccipital between buUse much wider. 



Color. Male similar to A. miriquouina but more tinged with red 



