212 SUPPLEMENT. 
[Didelphys murina (p. 200). 
An Opossum referable to this widely-distributed species forms the third of the land 
Mammalia obtained by Mr. Forrer in the Tres Marias Islands, the Raccoon and the 
Hare already mentioned being the other two. According to Mr. Forrer these three 
are the only land mammals indigenous to the islands, though one would have expected 
that some of the numerous Muride inhabiting the neighbouring mainland would be 
represented ; it appears, however, that the inhabitants know of no rats or mice what- 
ever in the islands, except, of course, the cosmopolitan Mus decumanus, Pall.—O. T.) 
