1910] Jackson, Distribution of Certain Wisconsin Mammals. 87 



As a result of inquiries made at Winona, Minnesota, and at 

 several places along the Wisconsin side of the Mississippi River, 

 and at various points in the Trempealeau and Black River valleys, 

 definite information was received concerning a migration of this 

 species. The information as given from several sources is so 

 universally the same in all essentials that it seems that there can 

 be no doubt as to its reliability. Briefly summed, the facts are as 

 follows: During the autumn of 1905 many squirrels migrated 

 across the Mississippi River from the Wisconsin side into Minne- 

 sota. , Most of these were in the gray pelage ; a few were the me- 

 lanistic phase. Many of them could be seen swimming across 

 the river and a considerable number were killed in the water by 

 boys. The migration was quite general ; immediately following 

 it there was a scarcity of gray and black squirrels in the regions 

 of the Trempealeau and Black Rivers. Later a large number of 

 these squirrels migrated back into Wisconsin. A few, however, 

 remained and took up their abode in the city of Winona, where 

 food was supplied them by the inhabitants. The direct cause 

 of the migration was a shortage of nuts on the Wisconsin side 

 of the river. 



Tamias striatus griseus Mearns. 

 Gray Chipmunk. 



As a result of observations made during the summers of 1908 

 and 1909 it appears that Tamias inhabits favorable places thru- 

 out the entire state with the possible exception of the extreme 

 northeast portion. They were seen near Alma, Cornucopia, Ham- 

 mills Lake, Minong, New Richmond and Upper St. Croix Lake. 

 One was distinctly seen August 13, 1908 near Lost Creek, two 

 miles west of Cornucopia and within one-half mile of Lake Supe- 

 rior ; here it shared the habitat with Butamias borcalis neglccius, 

 as it also did at Hammills Lake. 



Ci tell us tridecemlineatus (Mitchill). 

 Striped Spermophile. 



Citcllus tridecemlineatus was observed at Hixton, Iron River, 

 Platteville, Potosi and Sparta. 



A short distance east of Iron River there is a small and appar- 

 ently isolated colony of this species established in the midst 

 of a colony of Geomys in a sandy jackpine region. September 9, 

 1908 three of the spermophiles and many of their burrows were 

 seen. Mr. H. Hall, one of the older residents of Iron River and 

 a man upon whose word one can rely said of the spermophiles, 



