Cahn—Notes on the Vertebrate Fauna 
505 
found there. As nearly as the writer can make out at present, 
there is but the one subspecies of woodchuck found in this sec¬ 
tion of the north peninsula and it is probable that the subspecies 
rufescens does not occur as far north as this. 
Northern Flying Squirrel. Sciuropterus sabrinus (Shaw). 
The flying squirrel occurs in both counties, though it is but 
occasionally met with. The body of one that accidentally got 
into a steel trap was the only flesh specimen seen; this in Hough¬ 
ton county. 
Woods Beaver. Castor canadensis michiganensis (Bailey). 
Still to be found in each of the counties, though from the 
signs of former activity the animals are not nearly as numerous 
as in past years. A lodge in fairly good repair was found in 
one of the small lakes beyond Lake 33, and some fairly fresh 
cuttings were noted in this same general region. There are still 
several small colonies within about four miles of Kenton. 
Norway Rat. Epimys norvegicus (Erxleben). 
According to all reports, this is a comparatively recent addi¬ 
tion to the mammalian fauna of Houghton county, and at pres¬ 
ent the writer can offer no data as to its occurrence in Iron. Al¬ 
though not common in Houghton county, it occurs about Kenton 
not infrequently, and two were seen about the deserted build¬ 
ings of the old planing-mill. Tracks of the species were also 
found in the mud at the edge of the Kenton river, as was a 
badly mutilated dead specimen. 
House Mouse. Mus musculus (Linn). 
Rather common about some of the wooden dwellings of Ken¬ 
ton, and no signs of its occurrence in Iron county, though its 
presence there was not to be expected owing to the type of coun¬ 
try visited. 
Michigan Mouse. Peromyscus maniculatus gracilis (Le Conte). 
This large deer mouse occurs in Houghton county rather plen¬ 
tifully, but in no such abundance as it was found in Iron county 
about Lake 33. In this region it is the most common small mam¬ 
mal, and though strictly nocturnal in habits, it succeeds in mak- 
