92 CEBUS 



a history, its habitat unknown, and lacking even a single character to 

 separate it from a species described twenty years before, is a source of 

 confusion and perplexity to all investigators who are unable to have 

 personal knowledge of it. The practice of giving names to such 

 specimens, in which Gray was frequently an offender, is especially 

 reprehensible when indulged in with such a genus as Cebus, whose 

 members exhibit extreme variation in the colors of their coats, sur- 

 passed possibly by no other group of mammals, save, perhaps, the 

 squirrels of Mexico. 



The type of C. flavescens is in the British Museum, and may be 

 described as follows : crown, nape and dorsal region, pale brownish 

 yellow tinged with reddish on lower back ; sides of head, flanks, limbs, 

 under parts and tail pale yellow, tinged with reddish on outer side of 

 arms, thighs and upper side of tail ; hands and feet reddish brown. 



Cebus unicolor cuscinus Thomas. 



Cebus Havescens cuscinus Thos., Ann. Mag. Nat. Hist., VII, 7th 

 Ser., 1901, p. 179 ; Festa, Boll. Mus. Torino, 1903, p. 6. 



Type locality. Callanga, Cuzco, Peru. Type in British Museum. 



Genl. Char. Closely allied to C. unicolor Spix, but with a large 

 brown coronal patch. 



Color. Forehead and cheeks yellowish brown; crown and nape 

 dark chestnut; base of hairs pale brown; dorsal region mummy brown 

 tinged with reddish, brightest and reddest on the rump ; outer side of 

 arms pale brown ; legs reddish ; inner side of arms and legs pale 

 ochraceous rufous ; flanks pale brown ; throat and chest yellowish 

 white ; rest of under parts pale ochraceous rufous ; tail reddish brown, 

 base of hairs nearly white; hands and feet reddish, digits gray. Ex 

 type British Museum. 



Measurements. Total length, 730; tail, 390; foot, 250; ear, 35, 

 (Collector). Skull: total length, 92; occipito-nasal length, 82.4; inter- 

 temporal width, 40.5; Hensel, 60.3; zygomatic width, 61.1; width of 

 braincase, 50.7; median length of nasals, 15; palatal length, 29.2; 

 length of upper molar series, 18.4 ; length of mandible, 57.5 ; length of 

 lower molar series, 24.3. Ex type in British Museum. 



This is another species of Cebus described from a single immature 

 example, a female, but without some of the objections attached to 

 Gray's specimen, for this one has a history and we know the locality 

 whence it came. Although it exhibits some difference in color from C. 

 UNICOLOR Spix, mindful of the variations existing in their hues among 

 all the Capuchin Monkeys, the probability is that eventually it will 



