160 Copeland — Notes on the Mammals of Ml. Greylock, Mass. 



Evotomys gapperi ochraceus. 



The red-backed mouse appears to be the most abundant of the small 

 mammals, and nearly fifty were taken. It was secured in every station 

 trapped where the conditions were at all favorable for its occurrence. 



Microtus pennsylvanicus. 



The meadow mouse seems to be rather uncommon, and only nine were 

 secured. Their runways, however, were conspicuous within a limited 

 area a few hundred feet below the summit, but judging from the results 

 of our continued trapping the colony has recently undergone marked 

 depletion. 



Mr. William Dearden took about 14 specimens. 



Microtus pinetorum scalopsoides. 



One of the most interesting and certainly most inexplicable results of 

 our collecting was the capture of seven examples of the northern pine 

 mouse. A small colony was discovered on the very summit of the moun- 

 tain, living in the many cavities which occurred beneath the spreading 

 roots of the rather open growth of spruce and yellow birch. Six were 

 taken here, three of which were about half grown. The other specimen, 

 an adult, was trapped by a hole in the bank of the stream at " High 

 Bridge," two miles and a half down the mountain. Near by were taken 

 such northern species as the woodland jumping mouse and smoky 

 shrew. 



Dr. Glover M. Allen has kindly compared the series with specimens in 

 the Museum of Comparative Zoology and finds them "quite typical of 

 scalopsoides." 



How this animal has wandered from its accustomed home and taken 

 up its abode on a mountain top in the midst of Canadian environment, 

 is a question difficult to answer. Springfield, Mass., and Lake George, 

 N. Y., appear to be the nearest points to Mt. Greylock where the pine 

 mouse has been found. It may, therefore, have followed some tributary 

 of the Connecticut or Hudson Rivers, or worked northward through the 

 valley of the Housatonic to the Berkshires. In all likelihood future col- 

 lecting in western Massachusetts will reveal its presence more commonly 

 than is now known. 



Zapus hudsonius. 



Only one example of the Hudson Bay jumping mouse was secured. It 

 was taken on the edge of a small grassy clearing surrounding a pond a 

 few rods from the spot where the first specimen of Sorex dispar was 

 captured. 



Napaeozapus insignis. 



The woodland jumping mouse is common on Greylock, and no less 

 than twenty-six were trapped. Three were captured in woods on the 

 summit, but the greater number were found on the banks of a mountain 



