.154 Mr. 0. Thomas on 



Range from Periiambuco to Sao Paulo; Inland to MInag 

 Gerae?. Specimens in Museum tVom Baliia {Zoological 

 Society^', Rio Jordao, Minas Geraes {Robert); Alambary 

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

 {Hempel). Recorded by Lund from Lagoa Santa. 



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

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

 name, it may provisionally stand as 



Cavia aperea azarce. 

 Cavia azarce, Wagn., Sclir. Saug., Supp. iv. p. 63, footnote (1843). 



Colour, as represented by fresh skins, very much as in 

 true aperea or rather more olivaceous ; size averaging 

 slightly less, though individual specimens overlap. Averages 

 of four skulls in greatest length 65'8 mm.; bulla 12*4; 

 tooth-row 14"9. The bullae would, therefore, appear to be 

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

 indicate this with certainty. 



.^ti^. Paraguay. Several specimens from Sapucaj- ( W. 

 Foster^. 



Next southwards from C. aperea, in the province of 

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

 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. fulvida. Upper surface grizzled 

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

 with long blackish piles, especially posteriorly, the middle of 

 tlie lumbar region being nearly black. The 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 conspicuous!}' shorter and slenderer muzzle — in fact, the 

 skull, apart from the muzzle, is scarce!}' or not smaller than 

 that of aperea, the diifertjuce in the whole length being 

 almost entirely due to the reduction of the rostrum. Post- 

 orbital projections not heavily developed. Bulla} fairly large. 



Dimensions of the t^'pe : — 



Jlead and bodv 395 mm. ; hind foot 46 ; ear 20, 



