DIDBLPirVB P 08 II.LA. 
514 
All tlic above new species of Didelpliys, described by Ur. 
Wagner, are contained in the Museum at Vienna, and were 
collected in Brazil by the late Dr. Natterer. 
DIDELPHYS PUSILLA. 
Diminutive Opossum. 
Didefphis pusilla. Desmarest, Nouv. Diet. d’Hist. Nat. turn. ix. p. 430. 
1817. MammaJogie, Pt. 1, p. 261, sp. 399. 1820. 
Micoure sijirme, ou Aficovrf nain. Azara, E»«ii sur 1 Hist. Nat. dcs 
Quailnipi'des ilu Paraguay, tom. i. p. 304. 
Fur short, and soft; on the upper parts of the animal, mouse- 
grey, and on the under, whitish; eye surrounded with black, 
the black most extended in front; the region above the eye, 
whitish, and a yellowish white spot is situated beneath the 
eye; tail naked. 
Inhabits Paraguav. 
A small Opossum in the British Museum Collection bearing 
the name D. jn/sillu % agrees closely with Azams descrip¬ 
tion and dimensions. The specimen is preserved in spirits, and 
in its size and proportions, and (so far as one may judge from 
a specimen in the condition mentioned), in the character of 
the fur and its colouring, greatly resembles the Common 
Mouse. The under side of the tail at the extremity is per¬ 
fectly naked, and the callous skin of this part shows that it 
is used for prehension ; the naked part extends backwards 
from the point of the tail about half an inch ; the remaining 
portion is covered with small scales, from between which 
small hairs spring, ns in the common mouse. A narrow 
black ring surrounds the eye, and the sides of the muzzle, 
near the anterior angle of the eye, are dusky ; the upper lip 
