154 Mr. 0. Tliomas on 



Range from Pernambuco fo SsTo Paulo ; inland to Minas 

 Geracs. Specimens in Museum tVom Baliia [Zoological 

 Soci'eti/) ; Rio Jordan, Miiias Geraes (Robert) ; Alamhary 

 and Ypanema, Sao Paulo {Robert) ; and Victoria, Sao Paulo 

 {Hempel). Recorded by Lund from Lagoa Santa. 



The Paraguayan cavy is so similar to C. aperea tliat I 

 should probably not have distinguished it, but, as it has a 

 name, it may provisionally stand as 



Cavia aperea azara. 

 Cavia azara, AVagn., Scbr. Saug., Supp. iv. p. 63, footnote (1843). 



Colour, as represented b}' fresh skins, very much as in 

 true aperea or rather more olivaceous ; size averaging 

 slightly less, though individual specimens overlap. Aveiages 

 of four skulls in greatest length 65"8 nun.; bulla 12*-i; 

 tooth-row 14:"9. The bulla? would, therefore, appear to be 

 rather larger, but the imraber of specimens is not enough to 

 indicate this with certainty. 



Hub. Paraguay. Several specimens from Sapucay ( IF. 

 Foster'). 



Next southwards from C. aperea, in the province of 

 Parana, a special form was discovered by M. Robert, which 

 may be described as follows : — 



Cavia rosida, sp. n. 



Size less than in C. aperea, greatest length of skull about 

 62 mm. General colour saturate, comparatively dark, nearly 

 as much so as in C. fuhida. Up[)er surface grizzled 

 "mummy-brown"; median area of back lieavily blackened 

 with long blackish ])iles, especially posteriorly, the middle of 

 the lumbar region being nearly black. Tlie blackening is, 

 however, variable and occasionally almost absent. Under 

 surface dull cinnamon-buff, the hairs pale grey basally ; 

 usual throat-markings scarcely distinguishable, the inter- 

 ramia buffy, the usual dark collar overlaid with dull buffy, 

 and the white chest-patch either absent or reduced to a small 

 spot. Inner side of limbs like belly. 



Skull, as compared with that of C. aperea, smaller and 

 with conspicuously shorter and slenderer muzzle — in fact, the 

 skull, apart from the muzzle, is scarcely or not smaller than 

 that of aperea, the difference in the whole length being 

 almost entirely due to the reduction of the rostrum. Po.sfr- 

 orbital projections not heavily developed. Bulhe fairly large. 



Dimensions of the type : — 



Head and bodv 395 mm. ; hind foot 46 ; ear 20. 



I 



