the Species of the Genus Oavia. 157 



to distinjriiisli tlie Noith-Peruvian cavy specifically from 

 C. tschiidii, in view of its general agreement in size and other 

 characters. 



Cavia fschudii umbrata, subsp. n. 



Size as in atahual/ice. Colour j>reyer throughout, the light 

 rings on the hairs wbitisli instead of cinnamon or buffy. 



Median area of back blackish, the darkening being effected 

 not by overlaying with long black hairs, as in atahualpce and 

 roaida, but by the reduction of tlie light rings on the hairs, 

 these being often barely 1 mm, in length, while those in the 

 other subspecies are about 2-4 mm. as is usual. Bases of 

 liairs pale slaty. Under surface soiled drabby, the belly and 

 submaxillary lines of this colour ; collar and middle line of 

 chin greyish In-own. Hands and feet pale brown, lighter 

 on digits. 



Skull of average proportions, the biillas longer than in the 

 two following subspecies. 

 Dimensions of the type : — 

 Hind foot 42 mm. ; ear 20. 



Skull: greatest length 60; condylo-incisive length 58 ; 

 greatest breadth 57'7 ; nasals 20*5x8; diastema 18"2 ; 

 bulla 11*8 X 9 ; upper tooth-series 13. 



I/ah, Junin, Central Pern. Type from Incapirca, Zezioro. 

 Ti/pe. Adult female. B.M. no. 94. 8. 6. 23. Collected 

 20ih June, 1890, by J. Kalinowski. 



This Junin subspecies agrees witli atahxialpce by its 

 darkened back, rather larger size, and larger bnllse, as com- 

 pared with the two more southern forms that follow. From 

 atahualpce it differs in general colour very rr.uch as pam- 

 parnm differs from aperea^ and also in the details of the dorsal 

 daikening. 



Cavia tschudii tschudii, Fitz. 



General colour fairly dark, strongly grizzled, the light 

 rings on the hairs buffy or cinnamon. Under surface more or 

 less strongly buffy. Meilian area of back not darkened. 



Skull-length about 59-61 mm.; bullae rather smaller than 

 in the previous subspecies:, 10'1-10'9 mm. in length. 



Range. Middle Peru, from 19a to Cuzco. 



Tlie type-locality is Iga, and a specimen from Tambo, on 

 the coast opposite Arequipa, agrees so precisely with the 

 description as to be undoubtedly the same form. Four 

 specimens from Urubamba, Cuzco, collected by 0. Garlepp, 

 agree absolutely with that from Tambo, while three from 

 La liaja Pass^ collected recently by E. Heller, are rather 



