192 Mr. O. Thomas on new Callithrix, MiJa?, c&c. 



Bavtlett on the Upper Amazons, and referred by liim* to 

 M. Devillei, appear also to be referable to M. apiculatus, but 

 it is not clear exactly where they were obtained, as his state- 

 ment that he collected examples both on the Ucayali and 

 Huallaga would appear to have had reference to a larger 

 number of specimens than two, and these individuals may 

 have come from either of the two rivers. Their hands and 

 feet are even more strongly grizzled than are those of the 

 Copataza series. 



Felts Wiedii vigens, subsp. n. 



Fur of medium length; hairs of back about 13 mm. long. 

 Fur of nape from withers to crown smoothly and completely 

 reversed forwards. Ground-colour comparatively dark, near 

 "clay-colour^^ on the head, top of neck, and dorsal area, 

 bufTy white on sides, and scarcely lighter on belly, not pure 

 white anywhere. Longitudinal lines of nape strongly defined, 

 live in number — a median rather irregular one, split into two 

 in places, and two outer pairs of strong clear ones, the inner 

 of which is continuous with the supraorbital black line. 

 Median dorsal line commencing about a decimetre behind 

 withers, single and well-defined posteriorly, partially split in 

 two anteriorly. Spots of back and flanks oblong, elougate, 

 but rarely lengthened into lines, a slight lighter centre present 

 in some. Throat with three transverse dark lines, the two 

 anterior broken mesially. Chest and inguinal region dull 

 whitish, with few or no spots; belly profusely spotted. Ears 

 with their edges and inner surfaces strong clay-colour ; their 

 backs black, with their posterior halves dull buffy whitish, 

 not white, and not succeeded behind by a second black mark, 

 as is usually the case. Limbs coloured like body; the 

 spotting continued on to the metapodials. Palms and soles 

 smoky brown. Tail long, its ground-colour like the body, its 

 daik rings about twelve in number, rather broader than the 

 light ones, mostly broken below ; the extreme tip blackish. 



JSkull with a narrower and more elongate brain-case than 

 is usual in this group, the most convex part barely surpassing 

 in breadth the narrowest point on the ridge above the meatus 

 and considerably surpassed by the broad mastoid ridges, 

 which, in conjunction with the lambdoiJ crests, are here 

 unusually developed. Nasals large and broad, liulke very 

 large, much larger and approaching each other more nearly 

 than in any other skull seen of this group. 



* r. Z. S. 1871, p. 2:.'0. 



