l'?G Mr. 0. Thomas on the Si/stema(ic 



amount of peculiarit}', the real reason for its distinction lies 

 in the comparatively small size of the teeth, by which it is 

 distinguished from the other species of Mdogale. The teeth 

 of the type are unworn and quite perfect. 



Ihlictis suhaurantiaca modesta, subsp. n. 



Essential characters of true suhaurantiaca, this species 

 differing from the continental //. moschata by its smaller 

 size. General colour as in the tyi)ical form, except that the 

 white head-markings are greatly reduced. The usual frontal 

 white patch between eyes almost obsolete, a few odd hairs 

 alone white. White of cheeks not rising up to eye, the 

 brown bar below the eye over 5 mm. in breadth. Broad 

 white band between eye and ear reduced to a narrow line, 

 between which and the ear there is a broad area of brown 

 continuous with the general brown of the upper surface. 

 Back of ears brown, the edges only white. Nape-line nmch 

 reduced, interrupted on the neck, and only reaching to the 

 withers. 



Skull as in suhaurantiaca. 



Dimensions of the type (measured on skin) : — 



Head and body 338 mm. ; tail 148 ; hind foot 53. 



Skull: median length ID'S; zygomatic breadth 45 ; intcr- 

 orbital breadth 20; mastoid breadth 38; front of canine to 

 back oi m^ 24 ; combined length of;/ and ni^ 30. 



Jlah, Jilountains of Central i^'ormosa. Type from Bankoro. 



Type. Adult male. B.M. no. 8.4.1.53. Original num- 

 ber 70. Collected 30th March, 1907, for Mr. A. Owston. 

 Purchased. 



Distinguished from suhaurantiaca in very much the same 

 way as true moschata is ixomferreogrisea — that is, by the lesser 

 amount of the white head-markings. Both the latter are 

 larger than the Formosan forms. 



XX. — On the Sijatenialic Arra7i(]einent of the Marmosets. 

 By Oldfield Tuomas. 



(Published by permission of the Trustees of the British Museum.) 



The necessity for relabelling the Museum collection of 

 Marmosets has caused an examination into tlie question as 

 to how many genera of these animals should be recognized, 



