172 APPENDIX 



marks, approximately, the eastern boundary of the breed- 

 ing range of this species, and in the eastern 200 miles of 

 this district it is decidedly uncommon during the nesting 

 season. There are a few records of the bird's breeding in 

 Indiana (Hogback Lake, English Lake) and in Wiscon- 

 sin (formerly at Koshkonong and Horicon), but not until 

 Minnesota is reached does this duck breed commonly. 

 West of the Mississippi it breeds abundantly in North 

 Dakota, a few in southern South Dakota and rarely or 

 casually in Nebraska and Kansas. It is a common breeder 

 in Colorado, Utah and Nevada (Truckee Valley), and 

 probably breeds rarely in Arizona (Mormon Lake), but 

 as yet the species has not been recorded as nesting in 

 California. The main breeding range is northwestern 

 North America from Oregon and Minnesota north to the 

 Mackenzie Valley and central Alaska. A line from Fort 

 Churchill, Hudson Bay, to Franklin Bay is the approxi- 

 mate northeastern boundary of the range, thence west to 

 Kotzebue Sound. If this line from Franklin Bay to Fort 

 Churchill is continued to Chesapeake Bay, it marks the 

 approximate eastern limits at which the species is com- 

 mon in migration. Northeastward the species is known 

 as a rare migrant, in New England hardly more than a 

 straggler, but it has been recorded as far as Newfound- 

 land, southern Labrador (Natashquan) and northern 

 Ontario (Moose River.) The baldpate is rather rare on 

 the coast of Alaska, but is more common in the interior 

 and is a rare or casual visitor to the Near, Commander 

 and Bermuda Islands. 



Winter Range. — The baldpate is common on the Chesa- 

 peake in winter, but as it is rare directly to the northward 

 at all times of the year, it is evident that the migration is 



