24 University of Michigan 



Mkrosorcx Jioyi. Hoy Shrew. 



Black spruce-tamarack bog, i. Wet hardwood forest, i. 



One specimen was taken July 17 at Fish-hawk Lake in a 

 moderately wet part of the hardwood forest. Another was 

 taken July 29 at the edge of a small black spruce bog. 



Blarina brevicaiida tolpoidcs. Bob-tailed Shrew. 



Tall-sedge, 8. Black spruce — tamarack bog, i. 



Grassy-meadow, 6. Wet hardwood forest, 32. 



Alder-thicket, i. Dry hardwood forest, 8. 



Black ash swamp, 6. Shrub stage, i. 



Arbor-vitae swamp, 4. Paper birch — aspen stage, 6. 



The species is rather generally distributed, but is by far 

 the most common in moist woods. In the Cisco Lake Region 

 II were secured; in the Little Girl's Point district, 10; and 

 near Gogebic Lake in Ontonagon County, 52. In the latter 

 district it was the most abundant mammal species, even exceed- 

 ing Peromyscus in numbers ; indeed, Peromyscus was rela- 

 tively uncommon in the partly swampy woods of the region, 

 and it might be that the abundance of the bob-tailed shrews 

 accovmts for the scarcity of the deer-mice, for the shrews 

 undoubtedly at times prey upon the mice. The specimen 

 recorded above from the black spruce-tamarack bog was 

 taken near Gogebic Lake in a bogg}^- swamp, which, while 

 dominated by black spruces, yet contained a considerable num- 

 ber of arbor-vitae and hemlocks. 



In the wet hardwood forest near Gogebic Lake Blarina run- 

 Avays are exceedingly abundant, usually running along or 

 under sticks or logs. Commonly they are just under the 

 leaves, but sometimes for a short distance are without cover- 

 ing. One old- log examined was found to be honey-combed 

 with these tunnels. The deeper runways nearly always follow 

 down just under a tree root. 



