172 
MACKOrODID/K. 
up from an animal which does not differ specifically from the 
At. penicillatus of Mr Gray; the white termination to the 
tail, which is the only difference worthy of notice, is very 
probably an individual peculiarity. 
MACllOPUS ( Heteropus) LATERALIS. 
Black-flanked Rock-Kangaroo. 
Petrogale lateralis. Gould, Monograph of the Macropodidae, Pt. 2, 9th PI. 
Fur moderately long and soft ; general colour brownish grey; 
head and fore parts of the body almost destitute of the 
brown line, which, somewhat admixed with rusty yellow, is 
conspicuous on the hinder parts: a distinct white cheek- 
mark is followed above by a broad blackish baud running 
through the eye : a black mark runs from the occiput along 
the back of the neck ; sides of the body with a broad brownish 
black band, and with a narrower white baud immediately 
above this ; mesial line of abdomen of a pale buff-yellow 
colour: feet brown-black, more or less suffused with rich 
brown in parts: tail but little bushy at the basal half, which 
is nearly of the same general hue as the body; the apical 
half bushy, having long black, or nearly black, hairs. 
Inhabits Western Australia—Swan River district. 
Mr. Gilbert states that this species is only to be met with 
amongst the rocks in tbo interior, which aro intersected with 
caverns; that it is remarkably shy, seldom venturing out 
during the day, but feeds at night in the little open patches 
of grass. He bad never known it to stray more tliun two or 
three hundred yards from its retreats. When alarmed, it leaps 
most extraordinary distances from rock to rock, and with the 
greatest rapidity.— Gould's Monogr. 
The Black-ilauked Rock-Kangaroo greatly resembles the 
Brush-tailed species of New South Wales, but differs in being 
rather smaller, in having the fore part of the body more grey, 
