208 LEONTOCEBUS 



and vicinity of Pebas, Peruvian Amazons ; and the banks of the Javari 

 River, boundary between Brazil and Peru. 



Genl. Char. Pelage mostly brown and black ; head and face buff 

 yellow. 



Color. Forehead, and top of head buff yellow, some hairs ochra- 

 ceous, graduating into burnt umber on sides of head and back between 

 shoulders, outer side of arms, and throat ; lips white ; back black, the 

 hairs broadly tipped with buff; rump, legs, and under parts reddish 

 chestnut ; hands and feet black ; tail at base like rump, remainder black. 



Measurements. Similar in size to L. labiatus; tail, 265. Skull : 

 occipito-nasal length, 43, (broken) ; intertemporal width, 22 ; breadth 

 of braincase, 26 ; palatal length, 14 ; median length of nasals, 7 ; length 

 of upper molar series, 8 ; length of mandible, 30 ; length of lower molar 

 series, 10. Ex specimen British Museum. 



The type in the Munich Museum has lost most of the hair on the 

 top and sides of the head, and on arms to elbow; the left arm is 

 practically bare for entire length, as is also the hand. The hair is 

 mostly gone from the under side of the body. It therefore would not 

 serve to describe the species, and one was selected for this purpose 

 from the British Museum Collection. The skull is in the type specimen. 



Leontocebus graellsi (Espada). 



Midas graellsi J. de la Espada, Bol. Revista Univ. Mad., 1870, 8. 

 57; Milne-Edw., Archiv. Mus. Paris, I, 1878, p. 162, (note). 



RIO NAPO MARMOSET. 



Type locality. Banks of the Rio Napo, Ecuador. Type in Madrid 

 Museum. 



Color. Nose, forehead and center of head black ; from eyes to 

 ears and on cheeks, light chestnut ; back of head, nape, back between 

 shoulders, outer and inner sides of arms, and throat to breast black, 

 hairs tipped with gray and darkest on dorsal region, giving this part 

 a speckled brown appearance ; back and flanks mummy brown, hairs 

 tipped with gray, giving a grayish brown tint to these parts ; rump 

 tawny brown, the hairs being black at base, then tawny and tips grayish 

 brown ; thighs, and legs to ankles speckled brown and ochraceous buff, 

 the latter color being the tips of the hairs ; tail at base fuscous, more 

 clear brown than the rest of the pelage, and this color extends along 

 the tail beneath for one third its length, remainder of tail, hands and 

 feet black ; breast and abdomen blackish chestnut brown, hairs tipped 

 with yellowish ; inner sides of legs russet, the hairs being blackish at 

 base tipped with russet. 



