from Brazil and Ecuador. 189 



eyes almost obsolete, and the centre line between the nostrils 

 pale brownish white instead of pure white. Hands atid feet 

 more or less marbled with black and orange instead of clear 

 greyish. Tail-hairs, even near its base, almost or quite 

 Avithout orange rings, the great majority of the hairs being 

 simply black with white tips. 



Skull much as in true penicillata, but the middle upper 

 incisors show a curious difference in shape; for m jordani 

 they are longer, narrower, more parallel-sided, and less 

 strongly convergent towards each other than in penicillata^ 

 their breadth in the latter about two thirds their length, while 

 it is about half in the former. 



Dimensions of the type (measured in the flesli) :■ — 



Head and body 235 mm. ; tail 298 ; hind foot (s. u.) 58 ; 

 ear 20. 



Skull : greatest length W^'d ; basal length 32 ; greatest 

 breadth of brain-case 25 ; length of nasals laterally 8'6 ; 

 combined length of premolars and molars 8'8. 



Hah. Eio Jordao, S.W. Minas Geraes. Alt. 800 m. 



Tyiie. Adult female. B.M. no. 1. 11. 3. 9. Original 

 number 706. Collected 9th June, 1901. Seven specimens. 



The yellowish aspect of ihe belly and inguinal region, the 

 dulled whiteness of the nasal septum, the general absence of 

 yellow on the tail-hairs, and the long narrow incisors are the 

 most tangible characteristics of this inland race of the well- 

 known Callithrix peniciUata. 



Midas'^ Goeldii, sp. n. 



A uniformly dark species, the fur with hoary tips. No 

 special ear or other tufts. 



Fur long, soft, and straight ; hairs of back and shoulJers 

 about 28-30 mm. in length, those of the neck nearly equally 

 long, and theiefore projecting laterally far beyond the ears, 

 but not forming special ear-tufts. Muzzle thinly haired ; 

 crown and cheeks with hairs 10-15 mm. long, those on the 

 latter directed downwards. 



General colour blackish brown, the hairs of back " broccoli 

 brown'''' at base, darkening outwards to black, the extreme 

 tips (about 1-3 mm.) shining hoary or greyish coppery, 

 which colour is most prominent on the rump, base of tail, and 

 hind limbs. Many of the frontal hairs iioary yellowish 

 throughout. Muzzle and lips blackish. Ears naked behind, 

 a thin fringe ot blackish hairs on the outer half of their inner 



* In the absence of the skull I cannot be entirely certain that this 

 marmoset is not a Vallithru (Ilajxile auctonim). 



