C ALLICEBUS ' 241 



1855, p. 119; I. Geoff., Cat. Primates, 1851, p. 40; Dahlb., 



Stud. Zool. Fam. Reg. Anim. Natur., fasc. I, 1856, pp. 152- 

 ^ 154 ; Reichenb., Vollstand. Naturg. Affen, 1862, p. 22, fig. 58 ; 



Gray, Cat. Monkeys, Lemurs and Fruit-eating Bats, Brit. 



Mus., 1870, p. 54; Forbes, Proc. Zool. Soc. Lond., 1880, p. 



634. 

 Simla (Callithrix) amicta Humb., Rec. Obs. Zool., I, 1811, (1815), 



p. 357. 

 Callithrix amicta Spix, Simiar. et Vespert. Bras., 1823, p. 13, pi. 



XIII; Less., Spec. Mamm., 1840, p. 167; Forbes, Handb. 



Primates, I, 1894, p. 161. 

 Callithrix torquatus Schleg., Mus. Pays-Bas, Simiae, 1876, p. 235. 



(Part.). 



WHITE-CRESTED TITI MONKEY. 



Type locality. Forest of Olivenga near Solimoens River, Brazil. 



Geogr. Distr. Upper Amazon region, Brazil. 



Genl. Char. Similar to C. torquatus, but differs in having under 

 parts black instead of red. 



Color. Face bare ; white hairs on cheeks and on under lip ; head, 

 whiskers and throat, arms, legs, feet, tail and under parts of body 

 black; upper part of chest extending upward to ears in a half collar, 

 and hands white. 



Measurements. Total length, 863 ; tail, 482 ; foot, 76.2. Ex speci- 

 men in Paris Museum procured from Frank of Amsterdam in 1849. 

 It is marked "type" on the label, but of course it is not E. Geoffroy's 

 type. No skull. 



This species has frequently been considered the same as C. 

 TORQUATUS, but the black under parts of the body will always cause 

 it to be easily distinguished from its relative. It appears to be rare 

 in collections. 



Caixicebus ustofuscus Elliot. 



Calliccbus ustofuscus Elliot, Ann. Mag. Nat. Hist., XX, 1907, 7th 

 Sen, p. 185. 



Type locality. Brazil. Type in British Museum. 



Genl. Char. Allied to C. cupreus, but color much darker. Skull 

 has the teeth much larger; palate longer and narrower; braincase 

 wider; space between pterygoid processes and bullae, and the width 

 of basioccipital throughout its length, greater. Practically the skull 

 is larger and more massive in every way. Mandible much larger and 

 heavier, and the depth of the ramus very much greater. 



