1910] Heller—Mammais: Alaska Expedition, 1908. 341 
incisive foramina and slightly darker colors than the mainland 
specimens. Chenega and Knight Island material also is some- 
what darker than mainland specimens. The specimens from 
Cordova Bay and Valdez are smaller and grayer than the large 
series from Port Nell Juan. 
At Canoe Passage, Hawkins Island, voles were uncommon 
and confined to the narrow strips of rye-grass along the beach 
and on sand-spits. At Northeast Bay, Hinchinbrook Island, 
the species was more abundant, but confined to the rye-grass 
areas, as on Hawkins Island. Runways were also found to be 
plentiful about timber-line at 1200 feet in patches of carex, but 
no specimens were secured at these altitudes. The habits of 
the Microtus on Knight Island approached more nearly those 
of M. elymocetes. About Drier Bay on this island they were 
found at the margin of the forest and in the patches of deer 
cabbage on the side hills and tundras from sea-level to the limit 
of vegetation. The cut food material in the runways was chiefly 
carex, with some stems of purple iris and hellebore. 
About the south shore of Chenega Island voles were found 
numerous in the patches of rye-grass near the beach. From 
these centers of abundance they invaded the edges of the forest 
and tundra, but were nowhere found so common as in the rye- 
erass. They were not rare about streams in the patches of 
carex and in the meadows above the timbered areas about the 
summits of the highest peaks. At these altitudes they formed 
the chief food of the rough-legged hawks which frequented the 
high open meadows. In the denser grass patches their runways 
and burrows formed a complex reticulation on the surface. 
Small piles of the stems of rye-grass and iris eut into inch 
lengths were found about the runways. In places, little heaps 
of grass roots cut into short lengths were found exposed where 
the rain had washed the soil away from the burrows. These 
had evidently been stored in underground chambers for future 
use. 
These voles were very abundant on Grafton Island where 
they lived chiefly in the forest similarly to elymocetes of Mon- 
tague Island. On Dise and Eleanor islands they inhabited the 
small open patches of tundra scattered through the forest, but 
were somewhat less abundant than on Knight Island. 
