186 THE AXGLER AND HUXTSMAX 



Canvasback: 



"Aythya vallisneria, " or canvasback have for a sum- 

 mer home an area which begins over a thousand miles west 

 of Chesapeake Bay, which, until recently, was also a favor- 

 ite winter home for this species. The line of the Great 

 Lakes appears to be the general route traversed in this 

 southeastward migration, and a few ducks stop for the win- 

 ter as far north as Lake Erie and Avestern New York. The 

 large flocks that hitherto covered Chesapeake Bay are no 

 more; however, a few winter on the coast of the Carolinas. 



The winter range extends from the Valley of Mexico 

 north to southern Illinois, Colorado, Nevada, and southern 

 British Columbia. 



Broadbill: Scaup Duck: Blackhead: Bluebill: 



This is one of the most important game birds of the At- 

 lantic coast region from Massachusetts to Chesapeake Bay, 

 being probably more common here during the winter than 

 it is in any other part of its range, while most of the lesser 

 scaups winter south of that district, being most common 

 from North Carolina to Florida. 



The greater scaup also ranges nearly to the southwes- 

 tern boundary of the United States in southern Texas, 

 southern New Mexico, central Arizona, and to the vicinity 

 of San Diego, California, while a few winter in southern 

 Colorado, southern Utah, and more commonly in Nevada, 

 and on the Pacific Coast north to the Aleutian Islands. It 

 also winters throughout the Mississippi Valley north as far 

 as southern Wisconsin, but is hardly more than a straggler 

 in winter north of the Ohio river. Its scientific designa- 

 tion is "Aythya marila." 



Ring-necked Duck: 



The principal winter home of this duck, "Aythya col- 

 laris," is the Gulf Coast, from Florida to Texas, and it is 



