﻿THE ROCK-WALLABIES. 47 



sand-rocks among which this Wallaby is found is stated to be 

 tremendous, sometimes attaining at midday during the sum- 

 mer to as much as 136 degrees. 



V. LITTLE ROCK-WALLABY. PETROGALE CONCINNA. 



retroi:aIe conci/uia, Gould, Proc. Zool. Soc, 1842, p. 57 ; 



Thomas, Cat. Marsup. Brit. Mus., p. 71 (1888). 

 Hahnaturus conciiDius^ Schinz, Synops. Mamm., vol. i., p. 565 



(1844). 

 Macropus {Heteropus) cottcmnus, Waterhouse, Nat. Hist. 



Mamm., vol. i., p. 177 (1846). 



Characters. — Size very small ; form slender ; fur short, soft, 

 and silky. General colour rich orange-rufous ; under-parts 

 white or greyish-white ; face-markings obsolete. Ears very 

 short, pale fawn on the back. No shoulder- or flank-markings ; 

 limbs greyish-fawn ; tuft of tail yellowish-brown. Length of 

 head and body of immature male 14 inches. 



Distribution. — North-east Australia. 



VL YELLOW-FOOTED ROCK-WALLABY. PETROGALE XANTHOPUS. 



Petrogale xanthopus^ Gray, Proc. Zool. Soc, 1854, p. 294; 



Thomas, Cat. Marsup. Brit. Mus., p. 65 (1888). 

 Macropiis xanthopus. Flower, Cat. Osteol. Mus. Roy. Coll. 



Surg., pt. ii., p. 715 (1884). 



Characters. — Size large ; fur long, soft, and silky. General 

 colour grey, white beneath ; a well-defined white cheek-stripe ; 

 a rich orange spot above the eye ; a black streak from the back 

 of the head to the middle of the back. Ears long, yellow be- 

 hind ; a triangular brown blotch behind the elbow, followed 

 by a white stripe down the hip ; top of knee brown, with a 

 white patch on the outer side ; limbs rich yellow ; tips of toes 

 brown. Tail ringed above and on the sides with dark 



