the Spccios of tlie Gtuus Cavia. 157 



to (li.HtinoKisU the Noith-Peruvian cavy specifically from 

 C. t.'^ckudii, in view of its general agreement in size and otlier 

 characters. 



Cavia tschudii icmhrata, subsp. n. 



Size as in atahualpce. C-olour f^reyer throughout, the light 

 rings on the hairs whitish instead of cinnamon or buffv. 



Median area ot back blackish, the darkening being effected 

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

 rosida, but by the reduction of the light rin«s on the iiairs, 

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

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

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

 submaxillary lines of this colour ; collar and middle line of 

 chin greyish brown. Hands and feet pale brown, ligliter 

 on digits. 



Skull of average proportions, the bullae longer than in tlia 

 two following subs[)ecies. 



Dimensions of the type : — 



Hind foot 42 mm. ; ear 20. 



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

 greatest breadth 57-7; nasals 20"5 x 8 ; diastema 18"2 ; 

 bulla ll"8x 9 ; upper tooth-series 13. 



Nah. Junin, Central Peru. Type from Incapirca, Zezioro. 

 *2>;ve. Adult female. B.M. no. 94. 8. 6. 23. Collected 

 20ih June, 1890, by J. Kalinowski. 



This Junin subspecies agrees with atahnalpce by its 

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

 pared with the two more southern forms that follow. From 

 atahualpce it differs in general colour very truch as pam- 

 panim differs fronj aperta, 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 butf'y or cinnamon. Under surface moie or 

 less strongly buffy. Median 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. 



Mange. Middle Peru, from 19a to Cuzco. 



The type-locality is Ija, and a specimen from Tambo, on 

 the coast opposite Arequipa, agrees so precisely with the 

 description as to be undoubtedly the sanie form. Four 

 specimens from Urubamba, Cnzco^ collected by 0. Garlepp, 

 agree absolutely with that from Tambo, while tliree from 

 La liiiya Pass, collected recently by E. Heller, arc rather 



