56 BIRDS OF COLORADO. 



149. Aythya affinis. Lesser Scaup Duck. 



Migratory; not common. Its range is much the same as 

 the last species, but it is rather more common. Occasionally 

 found in southern Colorado in winter. Reaches northern Colo- 

 rado early in March. 



150. Aythya collaris. Ring-necked Duck. 



Migratory; rare. It is a little strange tha:t this duck 

 should be so uncommon as it seems to be in Colorado, since it 

 is more common ill Kansas than either of the others. Probably 

 occurs on both sides of the range, though all the records are on 

 the plains east of the foothills. Breeds far north. 



151. Clangula clangula americana. American Golden-eye. 

 Migratory; rare. Occurs throughout the State, but never 



common. Breeds far north, but begins to migrate early. 

 C. E. Aiken took one in southern Colorado at 9,000 feet on 

 August 30, 1874. 



152. Clangula Islandica. Barrow's Golden-eye. 

 Resident; not common. The distribution of Barrow's 



Golden-eye in Colorado is rather strange. It is a northern spe- 

 cies, coming south in the winter to Colorado, and then when 

 spring returns quite a share of these winter birds remain to 

 breed in the mountains. So there results the queer condition 

 of a northern species breeding in the mountains almost at the 

 extreme southern limit of its range. On the plains it is a rare 

 migrant and winter visitant; in the mountains it has been found 

 breeding throughout the whole western half of Colorado, usually 

 at about 8,000 feet. Chas. F. Morrison has the following note 

 concerning its occurrence: "This species might almost be 

 called a resident in southwestern Colorado. I can record its 

 breeding in Dolores County,, and have taken them all through 

 the winter in the ponds below Fort Lewis." (O. & O. XIII. 

 1888, 165.) It nests in trees. There are no records of its ex- 

 tending much east of the mountains far out on the plains, and 

 it never has been taken in Kansas. 



153. Charitonetta albeola. Buffle-head. 



Migratory; common. Occurs throughout the State in 

 migration, and is likely to be found near any open water in the 

 winter. Breeds far north. 



154. Harelda hyemalis. Old-Squaw. 



Winter visitant; rare. A northern species coming south 

 into Colorado in the late fall and winter. The only records 

 come from the north central part of the state where G. F. 

 Breninger writes that he found a dead bird on the shore of one 



