BIRDS OF ONTARIO. 17 



larly breeding in the interior of the Province. It is a common summer 

 resident of Manitoba. 



Arrives as soon as the marshes open and leaves when they freeze up. 



GENUS AIX. 



(144) Wood Duck. 

 (Aix sponsa.) 



Formerly an abundant summer resident, breeding everywhere 

 throughout the Province; it is still common, but its numbers are fast 

 decreasing. 



Arrives as soon as the ice is out of the marshes, departs about the 

 end of September. 



SUBFAMILY FULIGULIN/E. (THE SEA DUCKS.) 



GENUS AYTHYA. 



(146) Redhead. 



(Aythya americana.) 



A common spring and autumn migrant. They breed from the great 

 lakes northward and abundantly in Manitoba and the Prairie Provinces. 



The bulk of them retire southward when their haunts are frozen 

 over. In some seasons a considerable number spend the winter on Lake 

 Ontario. 



(147) Canvas-back Duck. 



(Aythya vallisneria.) 



A regular, but not generally a common spring and autumn migrant 

 in Ontario. It breeds commonly in the marshes of the North-West Pro- 

 vinces. 



(148) American 1 Scaup Duck. (Blue-bill.) 



(Aythya marila.) 



The great majority of these birds are spring and autumn visitors to 

 southern Ontario, but they do not go very far north to breed, and a 

 great many spend the winter along the shores of Lake Ontario. 



(149) Lesser Scaup Duck. (Little Blue-bill.) 



(Aythya affinis.) 



Like the last, the great bulk of these ducks are transient visitors in 

 spring and autumn, but some breed in all the large marshes throughout 

 the Province, even along our southern boundary where protected. For- 

 merly they bred regularly in the marsh near Hamilton, and also in ihat 

 near Toronto. 



2 B. 



