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.
Callithrix personatus, Geoffr., Ann. Mus., xix., p. 113 (1812); Spix, Sim. et Vespert. Bras., p. 18, pl. 12 (1823); Gray, Cat. Monkeys Brit. Mus., p. 56 (1870).
Callithrix 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.
Distribution.—Upper Amazon. Of all the species of the genus, this ranges furthest to the south—to 14° S. lat.
VIII. THE BLACK-FRONTED TITI. CALLITHRIX NIGRIFRONS.