74 MACEOPODID^. 



1. Onycliogale unguifera. 



Macropus unguifer, Gould, P. Z. S. 1840, p. 93 ; id. Man. Macrop. 



pi. IV. (animal) (1841); Waterh. Jard. Nat. Libr., Mamm. xi. 



p. 201 (1841) ; Less. N. Tabl. R. A., Mamm. p. 194 (1842) ; Gerv. 



H. N. Mamm. ii. p. 270 (1856); 8chhg. Dierk. p. 142 (1857); 



Gieh. SHug. p. 674 (1859). 

 Macropus (Onychogalea) unguifer, Gray, Grey's Austr. ii. p. 402 



(1841) ; Waterh. N. H. Mamm. i. p. 75 (1846). 

 Onychogalea unguifer. Gray, List Mamm. B. M. p. 88 (1843); 



Govld, Mamm. Austr. ii. pis, lii., liii. (animal) (1859); Krefft, 



Austr. Vert. p. 11 (1871). 

 Halmaturus unguifer, Schinz, Syn. Mamm. i. p. 547 (1844) ; JVagn. 



Schr. Saug. Supp. v. p. 303 (1855). 

 Onychogalea annulicauda, De Vis, P. Roy. Soc. Queensl. i. p. 157 



(1884). 



Nail-tailed Wallaby. 



Largest of genus ; form ligKt and slender. Ehinarium (PL XI. 

 fig. 5) broad, less hairy than in the other species, the hair coming 

 down in the centre barely to the level of the lower edge of the 

 nostril. Fur thick, close, and rather short, very largely composed 

 of the long, soft, rufous underfur. General colour uniform sandy 

 fawn*. Face and head pale fawn, the tips of the hairs white. 

 An indistinct white cheek-stripe. In some (? immature) specimens 

 the muzzle is brown, and there are darker markings between the 

 eye and ear and behind the base of the latter. Ears thinly covered 

 with white hairs. Neck and back uniform rich sandy fawn ; a 

 central darker stripe on the back and rump, very variable in its 

 intensity. Sides paler, the bases of the longer and the whole of the 

 underfur dark slate-colour. An indistinct white mark behind the 

 elbow, corresponding to the well-defined white line in the other 

 species, and a white hip-stripe present. Chin, chest, and belly 

 white, the bases of the hairs slaty grey. Arms and hands, feet and 

 front of legs white; back of legs fawn. Tail very long, white 

 above, sandy below, its terminal third showing a tendency to annu- 

 lation, the rings being brown and gradually becoming darker, and 

 coalescing into the wholly black tail-tip, the black hairs forming a 

 crest along the uppersides and a well-marked pencil at the tip. 

 Terminal nail (PI. XI. fig. 6) large and flattened laterally, from 

 10 to 15 mUlim. long and about 7 or 8 broad, placed vertically ; 

 wholly hidden in the long pencil of hairs. 



Shull heavily built. Facial portion very long in comparison to 

 cranial (facial index 250). Forehead markedly inflated, the pos- 

 terior half of the nasals much bowed upwards in the middle line. 

 Nasals evenly converging forwards, their greatest breadth nearly 

 half their length, their posterior edge sinuous. Interorbital space 

 flat, its edges converging backwards, overhanging, and forming 

 rudimentary postorbital processes. Palatal foramina rather shorter 



* In specimens long exposed to light this colour becomes nearly or quite 

 white, especially on the head. 



