SENIOCEBUS 187 



Marikina bicolor Reichenb., Vollstand. Naturg. Affen, 1862, p. 



11, fig. 33. 

 Seniocebus bicolor Gray, Cat. Monkeys, Lemurs and Fruit-eating 



Bats, Brit. Mus., 1870, p. 68. 



PIED TAMARIN. 



Type locality. Rio Negro, Brazil. Type in Munich Museum. 



Geogr. Distr. Eastern bank of the Rio Negro, Brazil. Pebas, 

 Upper Amazon west of Barra, (Castelnau and Dev.). 



Genl. Char. Head in front of ears naked; hairs on back of head 

 long, white ; face in young, hairy ; tail very long. 



Color. Head in front of ears, naked, black; back of head, neck, 

 back between shoulders, arms, chest to middle of belly ending in a 

 point, white; back and legs yellowish brown, darkest on dorsal line; 

 hands white ; feet golden yellow ; sides of lower chest, abdomen and 

 inner side of legs, deep orange rufous ; tail, black above, orange rufous 

 beneath. 



Measurements. Skin, total length, about 650; tail, 380. Skull: 

 occipito-nasal length, 49; zygomatic width, 34; intertemporal width, 

 24; palatal length, 14; width of braincase, 27; length of nasals, 7; 

 length of upper molar series, 9; length of mandible, 32; length of 

 lower molar series, 31. 



This monkey has a peculiar appearance with its bare head and 

 white coloring, which makes it rather exceptional among the Tamarins. 

 There is also a total absence of brilliant colors possessed by many of 

 its relatives, save on the under parts, inner side of legs and tail 

 beneath. The immature individuals have the head covered with short 

 white hairs. 



The type in the Munich Museum is not adult, the head being 

 covered with short white hairs. It is in good condition and is well 

 represented in Spix's plate, though the coloring in the specimen is not 

 so bright. Another specimen, not obtained by Spix, is older with the 

 head entirely bare. 



Bates, (1. c.) states that this monkey was rather common in the 

 forests at Barra on the lower Amazon, and is restricted so far as he 

 knew, to the eastern bank of the Rio Negro. 



A specimen in the Paris Museum, was obtained by Castelnau and 

 Deville at Pebas on the Upper Amazon west of Barras, where Bates 

 and Natterer also found this species. Like its relatives it goes in 

 small troops, running along the main boughs of the loftier trees, and 

 climbing perpendicular trunks, but never taking flying leaps. 



