SEVERN RIVER FLYING-SQUIRREL. 
205 
captured on the shores of Lake Huron, and at the bottom of James Bay, 
at Moose Factory. We obtained specimens in the neighbourhood of 
Quebec, AAdiere in the autumn they were exceedingly abundant. 
We have not a doubt it is found in the United States south of the river 
St. Lawrence, but at present have no evidence to that effect. It does not 
appear to exist on either slope of the Rocky Mountains, nor have we in 
fact been able to find any of our smaller Rodentia of the Atlantic States 
in those regions. 
GENERAL REMARKS. 
As long as only two species of Flying-Squirrel were known in North 
America, — the present species (P. sabrinus ) and the little P. volucella — there 
was no difficulty in deciding on the species, but since others have been 
discovered in the far west, the task of separating and defining them 
has become very perplexing. We will however endeavour, in our next 
article, in which we shall describe P. alpinus , to point out those characters 
which may enable naturalists to distinguish the closely allied species. 
The lower figure in the plate represents P. sabrinus, and should have 
been marked fig. 1. Our readers will please correct it accordingly. 
