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



surface. Under surface thinly liaired, blackish throughout. 

 Hands and feet unusually broad, wholly black above, without 

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

 to the hair?. 



In addition to the colours above described it should be 

 noted that the type has some irregular and unsym metrical 

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

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

 or less pathological, having grown upon places injured during 

 the animal's life. Marmosets in captivity are commonly 

 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. 



Skull not preserved. 



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

 then dismounted) : — 



H*ad and body 190 mm. ; tail 255 ; hind foot (s. u.) 66. 



Hab. Amazons; the type brought alive to Para. 



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

 Goeldi, of the Goeldi Museum, Para. 



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

 Paid J\Ianimals, this marmoset has been a puzzle for some 

 lime, but was ])rovisionally assigned to M. Weddelll, Deville, 

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

 the members of the group more closely, 1 am convinced that 

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

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

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

 above, that the white jjatches on tlie head and loins are 

 abnormal; but apart from these it cannot be referred to 

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

 back, and rufous thighs, while tiie uniform hoary-washed 

 blackish of M, (Joeldii is quite unique. 



Midas apiculatus, sp. n. 



M. DevlUei group. 



Muzzle white; head black; na}je, shoulders, and outer side 

 of lorcarms finely grizzled smoky reddish brown (near 

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

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

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

 patch over the knee grizzled like the shoulder colour. Lower 



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



I 



