in the Collection of the British Museum. 429 
red, especially near the end, base blackish ; hairs blackish, with 
‘long red tips. 
Hab. Brazil: B.M. Rio Negro: B.M. 
Var. «. Throat and belly paler. Bolivia. B.M. 
Var. 8. Throat and belly white. Bolivia. B.M. 
19. Macrozus brunneo-niger. 
Sciurus brunneo-niger, Castelnau, MS. B.M. 
Fur blackish olive, very minutely and 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. Macrozxus xanthotus. 
Fur soft, close, dark olive, very minutely black- and yellow- 
punctulated; sides of head and throat yellower; chin, throat, 
breast, 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 (O. Salvin) 
B.M. 
Very like the former, but smaller; perhaps, from the slender- 
ness of the tail, young ; but the chin and 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 griseogena. 
Sciurus ferrugineoventris (not Bachmann). B.M. 
Fur olive-grey, minutely punctulated with black and yellow ; 
