190 Mr. 0. Thomas on new Callitlirix, Midas, tfcc. 



surface. Under surface thinly haired, blackish throu,a;liout. 

 Hands and feet unusually broad, wholly black above, without 

 lighter tipping. Tail like body^ blackish, with lighter ends 

 to the hairs. 



In addition to the colours above described it should be 

 noted that the type has some irregular and unsyrametrical 

 patches of white hairs on the forehead, side of head in front 

 of the ears, and on the loins ; but I think that these are more 

 or less pathological, having grown up on places injured during 

 the animal's life. Marmosets in captivity are cominonly 

 fastened by a cord round the loins, and the white patches on 

 the loins are likely to have been caused thereby. There is 

 no trace of the normal marbling of the back so usual in the 

 group. 



8kull not preserved. 



Dimensions of the type (a skin, which has been stuffed and 

 then dismounted) : — 



Htad and body 190 mm.; tail 255; hind foot (s. u.) 66. 



Hub. Amazons ; the type brought alive to Para. 



Type. Male. B.M. no. 0. 2. 22. 1. Presented by Dr. E. A. 

 Goeldi, of the Goeldi Museum, Para. 



As may be seen by ihe note* in Dr. Goeldi's Catalogue of 

 Paia Mammals, this marmoset has been a puzzle for some 

 lime, but was provisionally assigned to M. Weddelli, Deville. 

 Now, however, that 1 have had the opportunity of studying 

 the members of the group more closely, I am convinced that 

 it is a form hitherto undescribed, and I am pleased to apply 

 to it the name of its donor, to whom our knowledge of the 

 Pard, fauna is so largely due. I still consider, as stated 

 above, that the white patches on the head and loins are 

 abnormal; but apart from these it cannot be reteired to 

 M. Weddelli, as that species has a white muzzle, marbled 

 back, and rufous thighs, while the uiiitorm hoary-washed 

 blackish of M. Goeldii is quite unique. 



Midas apiculatus, sp. n. 



M. DeviUei group. 



Muzzle white; head black; nape, shoulders, and outer side 

 of torcarms finely grizzled smoky reddish brovva (near 

 "burnt umber''' of llidgwa} ) ; back coarsely mixed black 

 and dull whitish, becoming more reddish on the loins ; hips 

 and outer side of legs to ankles dull pale chestnut-rufous, a 

 patch over the knee grizzled like the shoulder colour. Lower 



* Bol. Mus. Goeldi, iv. p. 54 (1904), 



