312 On a new Rhipidomys /row Ecuador. 



capturing remarkable novelties, even when unable to make 

 considerable collections, is again exemplified by his discovery 

 of this interesting bat, which, so like the common Stumira 

 lilium externally, represents a most distinct new genus. 



So great is this external resemblance of Corvira bidens to 

 Stumira lilium, that the only distinguishing character I can 

 at present point out is the decidedly darker colour, especially 

 below, all the other features being occasionally found in the 

 latter animal. Should any mistake have occurred in the 

 allocation of the skin to the skull, the latter should, of course, 

 be taken as the type of the new form. 



Rhipidomys equator is, sp. n. 



Closely related to R. leucodactylus, but with grey-mixed 

 belly. 



Size large, just about as in leucodactylus. Fur short and 

 crisp. General colour above lined greyish with a slight tinge 

 of fulvous, but the members of this genus vary so much in 

 their range of colour from fulvous to grey that little stress 

 can be laid on the exact shade of the far. Under surface 

 uniformly bluish grey, the bases of the hairs slaty, the tips 

 dull whitish ; chin and throat-hairs white to the base. Hands 

 and feet particoloured as in leucodactylus, the metapodials 

 mesially dark brown, the edges and digits white. Tail well- 

 haired, wholly dark brown. 



Skull quite like that of R. leucodactylus, and differing 

 equally from that of R. lucullus by its smaller size and 

 markedly smaller brain-case. 



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



Head and body 175 mm.; tail 220; hind foot 32; 

 ear 21. 



Skull : greatest length 40 ; condylo-incisive length 37*5 ; 

 zygomatic breadth 21 ; nasals 14*4 ; interorbital breadth 6*1; 

 breadth of brain-case 15"8 ; palatilar length 17*1 ; palatal 

 foramina 8*4 ; upper molar series 7. 



Hah. San Domingo, W. Ecuador (79° 6' W. ? 0° 13' S.). 

 Alt. 1600'. 



Type. Adult female. B.M. no. 15. 1. 1. 39. Original 

 number 414. Collected 8th July, 1914, by Gilbert 

 Hammond. Presented by Oldfield Thomas. Two specimens. 



This Ecuadorean Rhipidomys differs from the common 

 R. leucodactylus of Peru by its grey belly, that species having 

 the median ventral area quite white. From R. lucidlus, 

 which similarly has a greyish belly, it differs by its smaller 

 skull, and especially its smaller brain-case. 



