246 Dr. D. G. Elliot on apparently new 



This is a larger monkey than the next species, L. ubericola, 

 and fully equal in size to L lar/otricha. The type is an old 

 individual witli the teeth p^reatly worn and blackened. It is 

 much darker than L. ubericola, and the base of the hairs 

 ochraceous instead of buff. There are none of the blue and 

 silver-grey hues so characteristic of L. lagotricha, and the 

 red oi L. canus,i& absent altogether. 



It gives me great pleasure to name this fine species 

 after my friend Oldfield Thomas, Esq., Curator of Mammals 

 in the British Museum, who presented the type to the 

 Institution. 



Lagothrix ubericola, sp. n. 



Type locality. Barrigudo River Jurua, Upper Amazon. 



Geogr. distr. Upper Amazon, Rio Solimoens, and Rio 

 Jurua to Peru. 



Gen. char. Colour pale ; hair soft, rather short, buff at 

 base. 



Colour. Top of head to nape, inner side of hands, and feet 

 black ; upper parts of body and arms to elbows grizzled 

 wood-brown, with a reddish tinge on rump and thighs, the 

 hairs being buff at base, with a subterminal black ring and 

 whitish tips ; outer side of forearms iron-grey ; top of leg to 

 knee iron-grey, when the colour becomes blackish brown, 

 the hairs with yellow tips on the fingers and toes, which are 

 black ; flanks and sides of abdomen yellowish brown ; chest 

 and middle of abdomen black ; hairs of tail above like upper 

 side of legs, tawny ochraceous with black and white rings 

 and white tips, beneath rufous brown at base, rest black. 



Measurements. About the size of L. lagotricha, but more 

 slender. Skull: total length 116'6 ; occipito-nasal length 

 103 ; zygomatic width 65"7 ; intertemporal width 595 ; 

 palatal length 30; breadth of brain-case 61*5; length of 

 nasals 10*6; length of upper molar series 25 2; length of 

 mandible 69 ; length of lower molar series 29. 



Type. Adult, in British Museum, no. 3 9. 1. 3. 



The type is full-grown, but not an old animal, and differs 

 greatly from L. lagotricha ; and as the young of that species 

 resembles the adult, this one cannot be considered as repre- 

 senting the same species. The locality of the type is south 

 of the range of L. lagotricha. It is a much more slender 

 animal, and its very bright colour, a grizzled wood-brown, 

 makes it conspicuously different from all the other members 

 of the genus. 



