254 NORTHERN FISHES 



Track, Baptism, and Little Isabella rivers in the Lake Superior drain- 

 age and from Big Sandy Lake in Aitkin County in the Mississippi 

 drainage. A separate population of this species occurs in Iowa and ex- 

 tends up into southeastern Minnesota where it has been taken by the 

 Minnesota Department of Conservation from the Root River and the 

 Whitewater River. The nesting habits are probably the same as those 

 of the northern muddler. 



