in the Collection of the British Museum. 429 



red, especially near the end, base blackish ; hairs blackish, with 

 long red tips, 



i/fl6. Brazil: B.M. Rio Negro : B.M. 



Var. a. Throat and belly paler. Bolivia. B.M. 

 Var. /3. Throat and belly white. Bolivia. B.M. 



19. Macroxus hrunneo-niger. 

 Sciurus brunneo-niger, Castelnau, MS. B.M. 



Fur blackish olive, very minutely aud closely punctulated 

 with red yellow ; hairs short, close, black, yellow-ringed ; cheeks, 

 chin, underside of body, and inner sides and front edges of the 

 legs rufous ; feet red, more or less black-varied : tail full, elon- 

 gate, black, the hinder two-thirds red-washed; hairs black, those 

 of the end with a long red tip. 



Hab. Brazil (Castelnau). B.M. 



Smaller than M. Langsdorfii, the fur shorter, much darker, 

 and more minutely punctulated. 



20. Macroxus xanthotus. 



Fur soft, close, dark olive, very minutely black- and yellow- 

 punctulated ; sides of head and throat yellower ; chin, throat, 

 bi'east, belly, and inner sides of the limbs red ; spot at the back 

 of the ears bright yellow : tail grizzled like the back at the base, 

 upper surface red, lower black, red-margined ; hairs black, with 

 a red tip. 



Hab. Costa Rica, Veragua, Cordillera de Tale (0, Salvin) 

 B.M. 



Very like the former, but smaller ; perhaps, from the slender- 

 ness of the tail, young ; but the chin aud front of the throat are 

 yellow red, and not grey. 



21. Macroxus ignitus. 



Fur soft, abundant, dark olive, closely and minutely black- 

 and yellow-punctulated ; the head and outer sides of the limbs 

 rather yellower ; back of the ears bright red bay ; cheeks, chin, 

 and throat white; sides of the throat, chest, belly, and inner 

 sides of the limbs reddish yellow grey : tail grizzled like the back 

 at the base, black at the hinder half, red-washed ; hairs yellowish 

 or reddish, with two black rings, the upper one broad, and 

 those of the hinder half of the tail with long red-bay tips. 



Hab. Bolivia (Brydges). B.M. 



22. Macroxus griseoyena. 

 Sciurus ferrugineoventris (not Bachmann). B.M. 



Fur olive-grey, minutely punctulated with black and yellow ; 



