Occasional Papers of the Museum of Zoology 13 



habitat the blue-grass, Poa, is the dominant plant, growing to a 

 height of usually not over 0.5 meter. With the blue-grass are 

 associated a few thistles, yarrow, and several other herbs. During 

 the whole period of my stay in the region, July and August, the 

 habitat was very dry, and the grass and herbs had mostly dried 

 up. This habitat and all the other habitats of the clearing were 

 being heavily pastured by stock. 



Trap-lines totaling one hundred mouse traps, set on August 6 

 and August 18, took on the first nights two prairie white- footed 

 mice, one house mouse, and one young thirteen-striped ground 

 squirrel. More white-footed mice were taken on later nights. 

 Many ground squirrels were taken in larger traps at the 

 mouths of their burrows; most of these were young of the year, 

 and all of them were very fat in preparation for their approaching 

 hibernation. 



Cultivated field habitat: 



Scalopus aquaticus machrimis. Prairie mole. i. 



Peromysciis manicidatus bairdii. Prairie white-footed mouse. 23. 



Microlus ochrogaster. Prairie vole. i. 



Mus imisculus musculus. House mouse. 2. 



Sylvilagiis jioridaiius mearnsii. Mearns cottontail. 2. 



Cultivated fields occur throughout the region about the woods, 

 but the only ones in which trapping was done were wheat stubble- 

 fields. After the wheat was cut off these stubble-fields grew up 

 rather thickly to weeds. On the ground there were a number 

 of fallen heads of wheat and some shelled-out grain, furnishing 

 abundant food for mice. 



Seventy mouse traps set in a wheat stubble-field just north 

 of Warren Woods, caught on the first nights, August 13 and August 

 29, sixteen prairie white-footed mice. Other white-footed mice 

 and two house mice were taken on later nights. Several cotton- 

 tails were seen in this field, and a few mole ridges were noted. 

 A prairie mole was taken by Clift'ord Reid in a grassy patch at 



