48 ONYCHOGALE. 
3. ONYCHOGALE UNGUIFERA, Gould, sp. (1840). 
Nail-tailed Wallaby. 
Size large; form light and slender. Rhinarium broad, partially 
hairy, the hair extending downwards barely to the level of the 
lower edge of the nostril. Fur thick, close, and rather short. 
General color above rich sandy fawn, with a median darker band 
of varying intensity on the back and rump; below white. Ears 
thinly clothed with white hairs. An indistinct white mark behind 
the elbow. White hip-stripe present. Arms, hands, feet and 
fromt of legs white ; back of legs fawn color. Tail very long, 
white above, sandy-gray below ; the terminal third with brown 
rings which gradually darken posteriorly, and finally coalesce with 
the black tail tip, the black hairs forming a crest on the upper 
side, and a well marked pencil at the tip ; terminal nail large and 
flattened laterally, hidden by the black pencil. Canines present, 
perhaps to some extent functional. 
Dimensions.—Head and body about twenty-six inches; tail 
about the same length. 
Habitat.—North-western and northern Central Australia. 
References.—Thomas, B.M. Catal. p. 74, pls. ix. fig. 10 (upper 
Front teeth ), xi. figs. 5 (rhinarium ), 6 (nail of tail); Gould, Mamm. 
Austr. ii. pls. lii., li. 
Genus X.—PETROGALE, Gray (1837). 
Rhinarium naked. Fur on back of neck directed downwards. 
Central hind claws very short. Tail long, cylindrical, thickly 
haired, its extremity pencilled. No canines. 
a 1.2.3 0 0.0.3.4 RC a et 
Dentrition.—). o> C-@ FE soaw M-jasa * 2532. 
Habits.—Terrestrial ; herbivorous. 
1. PerroGALE concinna, Grould (1842). 
Little Rock-Walaby. 
Size small ; form slender. Fur short, soft, and silky. General 
color above rich orange rufous; below white or grayish-white. 
Face markings obsolete. Ears very short, their backs pale fawn. 
No shoulder or flank markings. Arms, legs, and feet grayish- 
fawn. Terminal pencil of tail yellowish-brown. 
Dimensions.—Head and body of fimm. about fourteen inches. 
Habitat.—North-west Australia. 
References.—Thomas, B.M. Catal. p. 71, pls. ix. fig. 9 (upper 
front teeth ), xii. fig. 4 (upper view of skull); Gould, Mamm. Austr. 
ii. pls. xlviii. 
