the Lower Amazons. 281 



but little caudal white, and may be the nearest ally of the 

 present form, but its tail has a considerably longer funy 

 portion at its base. 



54. Marmoset collega, sp. n. 



3 . 154. Villa Braga, Rio Tapajoz. 



A large species of the incana group ; furry part of tail 

 about an inch in length. 



Size rather larger than in incana. Fur of moderate length, 

 hairs of back about 7 mm. in length. General colour above 

 dull cinnamon, about as in M. murina. Under surface and 

 inner side of limbs dull creamy white, the whitish area 

 narrowed on the belly, where it is about an inch in breadth. 

 Black orbital rings well marked. Hands and feet whitish. 

 Tail-base furry for about an inch, though the fur there is only 

 about 4-5 mm. in length; rest of tail naked, brown, with 

 fine and inconspicuous white marblings throughout its length, 

 but these are probably often absent. 



Skull long, narrow, more strongly built than in incana, 

 with well-marked parallel beads along the supraorbital edges, 

 not projected outwards into ledges. Teeth proportionally 

 small. 



Dimensions of the type : — 



Head and body 148 mm.; tail 204; hind foot 21; 

 ear 22. 



Skull : greatest length 40*5 ; condylo-basal length 402 ; 

 zygomatic . breadth 20'7 ; nasals 19*3 X 4*7; interorbital 

 breadth 7; breadth across supraorbital beads 7*1; palatal 

 length 23; breadth across outer corners of m 2 11*4; maxillary 

 tooth-row 16*3 ; length of three anterior molaiitorm teeth* 

 6-4. 



Hob. as above. 



Type. Old male. B.M. no. 20. 7. 14. 40. Original 

 number 154. Collected 7th June, 1917, by Frauleiu 

 Snethlage. 



This species belongs to the incana group, which does not 

 have triangular postorbital processes projecting over the 

 orbits. It is larger and moie brown-coloured than M. tncana, 

 and has a longer furry base to its tail. This latter character 



* I. e., p*, ni 1 , arid m 2 , not mp 3 } p x , and m l as Dr. Cabrera seems to 

 have taken when describing- his type of Marmoset polita, which is n >t 

 adult, but still retains its milk p'\ This is clearly shown by the excellent 

 figure he gives. 



Ann. i0 Mag. N. Hist. Ser. 9. Vol. vi. 19 



