252 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. XL 



paper, and it gnawed all it could reach, and thus spent a large part 

 of the night in work. I could hear the work going on when I was awake. 

 In the morning it appeared to be reposing on the top of its nest; but 

 after watching it for some time, and seeing no motion, I lifted up the 

 glass and took the mouse in my hand. It showed no signs of life. I 

 now felt that perhaps my pet was indeed really dead; but remember- 

 ing what I had previously seen, I resolved to try to restore it again to 

 activity. By holding it in my hand and thus warming it, the mouse 

 soon began to show signs of life, and although it was nearly the whole 

 day in coming back to activity, at last it was as lively as ever, and 

 afterward, on being set free in the room it moved about so swiftly by 

 means of its long leaps, that it required two of us a long time to capture 

 it uninjured." 



Describing the habits of the Jumping Mouse in northern Illinois, 

 Kennicott says: "It is not very prolific and is nowhere numerous. In 

 northern Illinois it is found in the deepest woods, as well as in cultivated 

 fields, and on the prairie at a distance from any timber. In the woods 

 it is often found nesting in situations similar to those occupied by 

 the Mus leucopus. It cannot climb but crawls up the inside of hollow 

 trees to a considerable height from the ground, and is sometimes found 

 nesting in them; but its nest is often discovered under the bark of 

 rotten trees or stumps and, though not much noticed when inhabiting 

 these situations, it appears frequently, if not generally, to live in 

 burrows in the ground, as it nearly always does in the fields, and on 

 the prairies of course. It digs readily. Its burrow in summer is not 

 deep, and the nest is sometimes found in a tuft of grass above the 

 surface, or under an inverted sod. In cultivated fields, it lives under 

 fences and, like the mice and arvicolas, takes up its abode in grain that 

 has been cut and left standing out. 



"The food of this species appears to consist chiefly of herbaceous 

 plants, with their seeds, and the seeds and nuts of trees when it inhabits 

 the woods. In cultivated fields, it devours grain, of which it has 

 sometimes been observed to collect stores in its burrows" (1. c., p. 96). 



Specimens examined from Illinois, Wisconsin and adjoining states: 

 Illinois Fox Lake, 3 ; Galena, Jo Daviess Co., 3 = 6. 

 Wisconsin Beaver Dam, Dodge Co., 5; Conover, Vilas Co., i; (S. C.) 



Beaver Dam, Dodge Co., 12 = 18. 

 Michigan Dowagiac, Cass Co., 2. 



