400 



Life-histories of Northern Animals 



J)<,0 



Air 



Sirilied/Sjitvmohh{k''s 



times have I found this species thus utiUzing the burrows of 

 the Ground-squirrels for its own winter den. These galleries 

 were much plugged with soft earth and not easy to trace. 

 Most were one and one-half to one and three-fourths inches 



wide, and about 

 three inches down, 

 but never more 

 than six inches from 

 the surface. 



I have also seen 

 another burrow 

 that is attributed to 

 this species. It 

 goes down nearly- 

 straight for a dozen 

 feet. It may pos- 

 sibly be the winter 

 den, but I never 

 found the bottom 

 or the animal that 

 made it. The na- 

 tives say it is a well, 

 but I think they are 

 mistaken. 



In 1882 I pub- 

 lished certain draw- 

 ings of the prairie 

 in section. They 

 were the four faces 

 of one square hole. 

 The extent to which 

 the burrowing ro- 

 dents had recently interfered 'with the surface deposits was 

 very plain, but later studies showed that most of these results 

 were traceable to the Pocket-gopher (Tho?nomys), so that, 

 although the present species is an important secondary worker, 

 the subject is treated in the chapter devoted to Thomomys. 



wsurfMf 

 w 



about ;x.feet 



id:<w- 



Fig. 123 — Burrow of Striped Ground-squirrel. 

 Drawn by E. T. Seton, Carberry, Manitoba. Sept. 8, 1904. 



