JUMPING MOUSE. 
257 
description with a figure. Davies shortly afterwards published it under 
the name of Dipus Canadensis. Sabine published a specimen with a 
mutilated tail, which he named M. Labradorius, and Richardson a 
specimen from the North, which he referred to the northern species, 
under the name of M. Labradorius, supposing there was still another 
species, which had been described as G. Canadensis. We have compared 
many specimens from all the localities indicated by authors. There is 
a considerable variety in colour, young animals being paler and having 
the lines of demarcation between the colours less distinct. There is also 
a great difference between the colour of the coat of hair in the spring, 
before it is shed, and that of the young hair which replaces the winter 
pelage. The tail varies a little, but is always long in all the specimens. 
The ears, size, and habits of all are similar. We have thus far seen 
no specimen that would warrant us in admitting more than one species 
into our American Fauna. 
