APPENDIX. 301 
Characters.—Size rather less than in D. murina * fur ver; 
short, soft, and fine; general colour of upper-parts very like 
that of a house-mouse ; under-parts white, and sharply defined 
from dark of back bya broad band of paler grey. Eyes ringed 
with black, and the forward continuation of the pale lateral 
band causing the appearance of pale outer eye-rings, separated 
in the middle line by the darker middle line of the back. 
Ears large, leafy, and grey, with the anterior basal prominence 
little developed. ‘Tail long and, except at the extreme base, 
naked ; grey above for three-quarters its length, the terminal 
quarter and all the lower surface white. Front of fore arm 
paler grey than lateral band, upper surface of fore-foot white, 
as in the hind foot. (Zomas). 
Paraguay and Corrientes. 
Distribution: 
XII@. HOARY OPOSSUM. DIDELPHYS INCANA. 
Didelphys incana, Lund, Blk. Brazil, Dyr. Danks. Afhandl., 
wal. vill., p. 327 (1941) >} supra, p. 272. 
Micoureus incanus, Thomas, Ann. Mag. Nat. Hist., ser. 6, 
vol. xiv., p. 186 (1894). 
Mavrmosa incant, Thomas, op. cé¢., vol. xviii. p. 313 (1896). 
Characters.—Generally, those given in the text under the 
heading of D. grisea, but the grey of the upper-parts shading 
gradually into the white of the belly. 
Distribution.—Central and Eastern Brazil. 
X110. MERIDA OPOSSUM. DIDELPHYS FUSCATA. 
Marmosa fuscata, ‘Thomas, Ann. Mag. Nat. Hist., ser. 6, 
vol. xviii., p. 313 (1896). 
Characters.—Size rather smaller than in D. zucana. Ears 
large, their internal basal projection small; a rounded lobe at 
