142 ALLEN’S NATURALIST’S LIBRARY. 
V. THE RED-BELLIED TAMARIN. MIDAS RUFIVENTER. 
Midas rufiventer, Gray, Ann. and Mag. N. H., xii, p. 398 
(1843); id. P. Z. S., 1865, p. 735; id. Cat. Monkeys 
Brit. Mus., p. 66 (1870). 
Midas elegantulus, Slack, Proc. Acad. Nat. Sc. Philad., 1861, 
p. 463. 
Hapale labiata (nec Geoffr.), Schl., Mus. Pays Bas, vii., p. 
260 (part). 
Characters.— Head, throat, fore-limbs, tail, and hands deep 
glossy black; hairs of back, sides, and posterior limbs black, 
broadly tipped with white, not regularly ringed ; belly, breast 
and inner surface of limbs bright brick-red, separated by a 
distinct line from the black of the back and outer surface of 
the limbs. On the back of the head a small patch of the same 
colour as the back; on the top of the head a golden-yellow 
triangular patch. Lips and tip of the nose, white. 
This species is distinguished from the White-lipped Tamarin 
(M. labiatus) by the spot on the crown and nape; and by the 
rufous of the under side extending forward nearer to the 
throat. 
Distribution—Banks of the Upper Amazon. Mr. Bates shot 
a specimen at Tunantins in 69° W. long., and 4° S. lat. 
Habits—Nothing is known of the habits of this species. 
Closely allied to the Red-bellied Tamarin is the so-called 
MousTACHED TAMARIN (A/idas mystax, Spix), in which the head, 
shoulders, and tail are black ; the body above brown, some- 
times ringed with white, and the belly bright rust-coloured. It 
can be distinguished, as Dr. Slack points out, from JZ. rufi- 
venter, by the want of the ashy tips to the hairs of the back 
