Amazonian Monkeys. 89 



This monkey seems to be a modification of C. donaco- 

 philus in the direction of the highly ornamented G. ornatus, 

 but its blackened tail is different from either. It had been 

 previously referred to the former species, but the good series 

 of that animal recently received from Bolivia has enabled me 

 to correct the mistake. 



Callicebus hoffmannsi, sp. n. 



A greyish species with light yellowish underside and 

 hoaiy hands and feet. 



General colour of body above about as in C. donacophilus, 

 greyish brown with a subdued undertone of rufous, most 

 marked on the loins. Crown grizzled grey, nearly as in 

 C. egeria. Cheeks, whole of under surface, and inner side of 

 limbs light yellowish or pale buffy, very different from the 

 strong rufous of these parts in the allied species. Arms and 

 legs grizzled grey like the crown, without brown or rufous 

 suffusion. Hands and feet blackish grizzled with white, the 

 result being a hoary slate-grey. Tail black throughout, the 

 hairs scarcely paler at their bases. 



Anterior nares large, widely open, evenly rounded. 



Dimensions of the type (measured in skin) : — 



Head and body 375 mm. ; tail 440 ; hind foot 91. 



Skull : greatest length 65 ; nasal opening 7"8 X 6*8 ; pre- 

 molar-molar series 15. 



J lab. Urucurituba, Santarem. 



Type. Old male. B.M. no. 8, 5. 9. 11. Collected 13th 

 February, 1906, by W. Hoffmanns, after whom 1 have named 

 the species. 



This species is widely different from any hitherto described, 

 as its hoary slaty-grey hands and feet are quite unlike the 

 red, black, or whitish feet found in other species. C. cine- 

 rascens, Spix, would appear to have similar feet, but its 

 under surface is also grey, and not yellowish. The tail of 

 C. hojfmannsi also is even more completely black than that 

 of C. remidus, most of the allied species of the genus having 

 this member either reddish or whitish. Nor has any pre- 

 viously known species of the genus a similarly coloured 

 under surface. 



Callicebus egeria, sp. n. 



General coloration quite as in C. cupreus, but the crown of 

 the head, instead of being distinctly more fulvous or ferru- 

 ginous than the back, is less so, being a clear grizzled grey, 



