Saccopteryx dec. from South America. 369 



The nearest allies of S. Ingrami appear to be the j^ruup of 

 Andean squirrels to which the names of S. trrorahcs, Gray 

 (Upper Ucayali), S. ccstuans cuscinus, Thos. (S.E. Peru), 

 and S. leucogaster, Gray (Bolivia), have been ^iven. 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 have 

 only three pairs of mammaj — one axillary, one ventral, and one 

 inguinal — instead of the four pairs found in S. Ingram!. 



It has been by the generous assistance of Sir William 

 Ingram, Bart., that Mr. Robert has biien enabled to undertake 

 a collecting trip to Southern Brazil; and it is therefore with 

 very great pleasure that I have connected his name with this 

 interesting squirrel, whose study clears up an error in deter- 

 mination of very long standing. 



Rhipidomys henevolens^ sp. n. 



Closely allied to, and of the same rich fulvous general 

 colour as, the N. Ecuadorean R. 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 R. dryas, the former not contrasting strongly with the 

 colour of the head, as is the case in R. plueotis. 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. phceotis and dryas, just 

 intermediate in size, but without any very special characters 

 of its own beyond what may be gatiiereil from the measure- 

 ments below. Nasals narrow. Palatal foramina not reaching 

 level of molars. 



Dimensions of the type (measured in the flesh) : — 



Head and body 110 raillim. ; tail 112; hind foot, s. u. 20, 

 c. u. 21*5 ; ear 16. 



Skull: greatest length 29; basilar length 22*7; greatest 

 breadth 15'5 ; nasals 10*5 X 3*1; interorbital breadth 4"<5 ; 

 breadth of brain-case 12*.3 ; interparietal .'3'-4xD'8; palate 

 from hcnselion 12 ; diastema I'd ; palatal foramina 5 X 2*3 ; 

 length of upper molar series ■!. 



llab. Chimate, Upper Beni River, Bolivia, GS° W., 15^ S. : 

 alt. 700 m. 



Type. Male. B.M. no. 1. 2. 1. 14. Original number 



