Saccopteryx dc. from South America. 369 
The nearest allies of S. Ingram? appear to be the group of 
Andean squirrels to which the names of S. ¢rroratus, Gray 
(Upper Ucayali), S. wstuans cuscinus, Thos, (S.K. Peru), 
and S, leucogaster, Gray (Bolivia), have been given. But 
these Andean forms are all a darker olivaceous, less greyish 
in tone, their bellies are all tinged, whether strongly or feebly 
with yellowish or orange instead of buffy, and they all age 
only three pairs of mammz—one axillary, one ventral, and one 
inguinal—instead of the four pairs found in S. Ingrame. 
Tt has been by the generous assistance of Sir William 
Ingram, Bart., that Mr. Robert has been enabled to undertake 
a collecting trip to Southern Brazil; and it is therefore with 
very great pleasure that 1 have connected his name with this 
interesting squirrel, whose study clears up an error in deter- 
mination of very long standing. 
Rhipidomys benevolens, sp. un. 
Closely allied to, and of the same rich fulvous general 
colour as, the N. Ecuadorean &. dryas, Thos. Size 
slightly larger than in that species. Face and sides of 
shoulders markedly greyer than the crown and nape, which 
are rich fulvous like the back. Ears with their anterior 
coronal surface brown, their postero-internal yellowish, about 
as in 2. dryas, the former not contrasting strongly with the 
colour of the head, as is the case in A. pheotis. Under 
surface white, the hairs white to the roots, the line of demar- 
cation not very sharply defined, but with a clearer fulvous 
line edging the two colours. Hands and feet whitish fulvous 
above, the digits quite white. ‘Tail uniformly blackish brown, 
pencilled as usual in the genus, though not heavily so. 
Skull, as compared to those of R. phwotis and dryas, just 
intermediate in size, but without any very special characters 
of its own beyond what may be gathered from the measure- 
ments below. Nasalsnarrow. Palatal foramina not reaching 
level of molars. 
Dimensions of the type (measured in the flesh) :— 
Head and body 110 millim.; tail 112; hind foot, s. u. 20, 
Cu. 32°)" ear 16: 
Skull: ‘greatest length 29; basilar length 22:7; greatest 
breadth 15° 5; nasals 10° 5x 31; : interorbital breadth 4°5 ; 
breadth of brain-case 12°5; interparietal 3°4x9°8; palate 
from henselion 12; diastema 7°3; palatal foramina 5 x 2:3; 
length of upper ota series 4. 
Hab. Chimate, Upper Beni River, Bolivia, 68° W., 15° 
alt. 700 m. 
Type. Male. B.M, no. 1. 2. 1. 14. Original number 
