THE OPOSSUMS. at 
or seven, one of which is placed as a centre and surrounded 
by the others. 
Distributions—Guiana and Brazil. 
XVII. GREY-FACED OPOSSUM. DIDELPHYS DOMESTICA, 
Didelpnys domestica, Wagner, Archiv. fiir. Nat., vol. viii. p. 
359 (1842); Thomas, Cat. Marsup. Brit. Mus., p. 358 
(1888). 
Characters.— Size large ; fur thick, straight, and soft. General 
colour pale grey, without dark eye-marks ; under-parts white or 
greyish-white, sometimes tinged with yellow. Ears large and 
rounded. ‘Teats thirteen, of which three are central, and the 
remainder arranged in lateral pairs. Fifth hind toe reaching to 
the middle of the second joint of the fourth. Tail little more 
than half the length of the head and body, its basal half-inch 
furred and grey, elsewhere short-haired and dark brown. Length 
of head and body of male about 514 inches; of tail 234 inches. 
Distribution.— Brazil. 
XVIII. RED-FACED OPOSSUM. DIDELPHYS SCALOPS. 
| Didelphys (Peramys) scalops, Thomas, Ann. Mag. Nat. Hist., 
ser. 6, vol. i., p. 158, and Cat. Marsup. Brit. Mus., p. 359 
(1888). 
Characters—Form rather more light and slender than in the 
last species, from which this one may be distinguished by the 
rufous head, rump, and tail, and the grey fore part of the 
back and under-parts. The number of teats is unknown. 
Distribution.—Brazil. 
This Opossum, in which the distribution of the rufous and 
_ grey forming its general colour is very remarkable, was de- 
scribed on the evidence of two specimens in the British 
