256 LLOYD'S NATURAL HISTORY. 
An imperfectly known species nearly related to AL. rodustus, 
but distinguished from it, as well as from JZ adtus, by the 4! 
much slighter downward inclination of the upper border of the 4 y 
lower jaw in front of the premolar teeth. ! 
Distribution.— Queensland. 
V. MACROPUS BREHUS. 
Sthenurus brehus, Owen, Phil. Trans., 1874, p. 272. 
Protemnodon mimas, Owen, op. cit., p. 278. 
Macropus brehus, Lydekker, Cat. Foss. Mamm., pt. v., p. 207 
(1887). 
Characters.—This and the three remaining extinct species of 
the genus belong to the group of larger Wallabies, as defined 
on p. 14, although they vastly exceed all the existing species 
of that group in point of size, being, indeed, superior in this 
respect to the largest living Kangaroos. In all of them the 
last premolar is characterised by its great longitudinal length, 
as well as by the vertical flutings on the sides of its sharp and 
trenchant crown. The upper molars have no longitudinal 
bridge connecting the anterior basal ledge with the first trans- 
verse ridge ; and in both jaws the molars are relatively wide, 
and have a low longitudinal bridge connecting the two trans- 
verse ridges. 
By Garrod these gigantic extinct Wallabies were regarded as 
allied to the Kangaroos of the genus Dorcopsis, which they re- 
semble in the length and general form of the last premolar. 
The elongation of the latter tooth is, however, not so great as 
in that genus, from which these Wallabies are further distin- 
guished by the presence of the longitudinal bridge connecting 
the transverse ridges of their molars, by the large size of the 
innermost pair of upper incisor teeth, and by the total absence 
of the upper canine. 
