THE TITI MONKEYS. 163 
Characters.—General colour black and grey, grizzled ; fore- 
head and ears white, instead of black as in C. caligata, or 
coppery-red .as in C. cuprea,; temples, cheeks, throat, under 
side of body, and inner side of legs, bright chestnut ; hands 
and feet grey ; tail black, with a grey tinge,—the hairs being 
grey, witha dark ring near the tip of each; hands and feet the 
colour of the back. 
Distribution.—U. S. Colombia ; vicinity of Bogota. 
Habits.—This species is arboreal, like the other members of 
its genus, and it is said to be nocturnal. It spends the day 
rolled up very much as many of the Lemurs do. 
VII. THE MASKED TITI. CALLITHRIX PERSONATA. 
Caliithrix personatus, Geoffr., Ann. Mus., xix., p. 113 (1812) ; 
Spix, oie ct; Vespert, Bras., p: 15, pl. 12° (1823) ;.Gray, 
Cat. Monkeys Brit. Mus., p. 56 (1870). 
Caliithrix brunnea, Wagner, Arch. f. Naturg., 1842, i., p. 357 
(ex Natterer, MSS.). 
Pithecia melanops, Vigors, Cat. Coll. Zool. Soc., p. 6. 
Callithrix personata, Schl., Mus. Pays. Bas, vii., p. 231 (1876). 
Characters.—Size larger than that of the other Titis. Style of 
fur the same as in the previous species, but longer, and the 
long stiff hairs more bristly; general colour black, mottled with 
grey rings on the hairs; back grizzled grey; entire head, hands, 
feet, and lower part of limbs, black ; chest, under ‘side of the 
body, and tail dark ashy-grey, the latter washed at the base, 
sometimes extensively, with rufous, and grey towards the tip 
below. 
Female.— Body strongly washed with whitish-yellow, and the 
tail with rufous ; forehead between the ears, black. 
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