12 University of Michigan 



few places small blackberry thickets occur in the areas of rushes 

 and dominate all other plants. 



Fifty traps set in this habitat, on August 8, took on the first 

 night one prairie white-footed mouse and one Pennsylvania vole; 

 the prairie white-footed mouse was taken just at the edge of 

 the growth of rushes. Other Pennsylvania voles as well as a 

 lemming-vole, a prairie vole, and several young ground squirrels 

 were secured on later nights by the same trap-line. A skunk 

 den was situated in a blackberry thicket in the midst of the largest 

 patch of rushes. 



Clear ed-upl and sedge habitat: 



Peromyscus manicidatiis bairdii. Prairie white-footed mouse. 3. 



Microtus pennsylvaniciis peniisylvanicus. Pennsylvania vole. i. 



Microtus ochrogaskr. Prairie vole. q. 



Mus muscnlus musculus. House mouse, i. 



Cikllus tridecemlineatus Iridecemlinealiis. Thirteen-striped ground squirrel. 

 Burrows. 



Sedges are dominant over a part of the cleared upland, occur- 

 ring on the moist gentle slopes which are too well drained for rushes, 

 but not in any numbers on the drier and higher parts of the upland. 

 With the sedges there are a few grasses, and the ground is sometimes 

 covered by a moss, but the sedges are by far the most abundant 

 plant. 



Fifty mouse traps set in this habitat took on the first night, 

 August 15, one prairie white-footed mouse and one prairie vole. 

 Other prairie voles and white-footed mice were taken on later 

 nights, as well as one Pennsylvania vole and one house mouse. 

 Burrows of the thirteen-striped ground squirrel were numerous 

 in the sedges. 



Clear ed-uplaiid blue-grass habitat: 



Peromyscus manicidatus bairdii. Prairie white-footed mouse. 12. 



Mus musculus musculus. House mouse, i. 



Citellus tridecemlineatus tridecemlineatus. Thirteen-striped ground 

 squirrel. 23. 



The most widespread habitat of the cleared upland on the 

 south part of the preserve is the blue-grass habitat. In this 



