14 Bulletin Wisconsin ISfatural History Society. [Vol. 6, Nos. 1 — 2. 
certain other species which without doubt have occurred within 
the state in earher days if they do not occur at the present time 
but of which we have no actual records ; among these might be 
mentioned Alces americanus Jar dine, Bison bison (Linnaeus), 
Felis concolor Linnaeus, Gulo lusciis (Linnaeus), and Mustela 
pennanti (Erxleben.) 
There are two specimens of Gulo luscns in the PubHc Museum 
of the City of Milwaukee, labeled "Wisconsin", but as there are 
no other data we consider the record unsatisfactory. The writer 
has examined specimens from Wisconsin of all species recorded 
with the exception of Sorex hoyi Baird. 
The author wishes to acknowledge his gratitude to all who 
have aided him in his studies of Wisconsin mammals. Acknowl- 
edgments are especially due to Dr. H. V. Ogden and to the officials 
of the Public Museum of the City of Milwaukee for the privilege 
of examining specimens in their respective collections ; also to Dr. 
C. Hart Merriam, Mr. E. W. Nelson, Mr. Vernon Bailey, Mr. W. 
H. Osgood, and to others of the United States Biological Survey 
for identifying certain specimens and for substantiating identifica- 
tions of many other specimens. 
Didelphis virginiana Kerr. 
Opossum. 
Didelphis virginiana is occasionally captured in the south cen- 
tral portion of the state. One was taken in Green County, January 
24, 1902, and again in the autumn of 1906 two more were taken 
near the same locality. Mr. Moses Strong reported it as found 
occasionally in the vicinity of Lake Michigan ( i ) ; but this has 
not been our experience as we find no records for this region. 
Odocoileus americanus borealis Miller. • 
Northern Deer. 
Deer are gradually diminishing in numbers wherever they are 
found. The cause of this decrease is not inefficient legislation, but 
