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. 
Ietrogale concinna, Gould, Proc. Zool. Soc., 1842, p. 57; 
Thomas, Cat. Marsup. Brit. Mus., p. 71 (1888). 
Halmaturus concinnus, Schinz, Synops. Mamm., vol. i., p. 565 
(1844). 
Macropus (Heteropus) concinnus, 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. 
| VI. YELLOW-FOOTED ROCK-WALLABY. PETROGALE XANTHOPUS. 
| Petrogale xanthopus, Gray, Proc. Zool. Soc., 1854, p. 294; 
Thomas, Cat. Marsup. Brit. Mus., p. 65 (1888). 
| Macropus 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 
| 
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