3V2 BIRDS OF THE ROCKIES 



152. Barrow's golden-eye. Clangula islandica. Sum- 

 mer and winter resident ; a northern species, but breeds 

 in mountains of Colorado, sometimes as high as 10,000 

 feet ; rare on plains. 



153. Buflle-head. Charitonetta albeola. Common 

 migrant throughout State ; breeds in the North. 



154'. Old squa-w. Harelda hyemalis. Rare winter 

 visitor ; a northern species. 



155. Harlequin duck. Histrionicus.histrionicus. Resi- 

 dent ; not common ; a northern species, but a few breed 

 in mountains at an altitude of 7,000 to 10,000 feet. 



l60. American eider. Somateria dresseri. Very rare ; 

 only two records — one somewhat uncertain. 



l63. American scoter. Oidemia Americana. Rare 

 winter visitor ; northern bird, in winter principally along 

 the sea-coast, but a few visit the larger inland lakes. 



165. White-'winged scoter. Oidemia deglandi. Same 

 habits as preceding ; perhaps rarer. 



166. Surf scoter. Oidemia perspicillata. Same as 

 preceding. 



167. Ruddy duck. Erismatura jamaicensis. Common 

 summer resident ; both sides of the range ; breeds from 

 plains to 10,000 feet; a beautiful bird; author's observa- 

 tions given in Chapter VII. 



l69- Lesser snow goose. Chen hvperborea. Migrant 

 and winter resident ; not common ; breeds far north. 



l69a. Greater snow goose. Chen hvperborea nivalis 

 Rare migrant ; only two records ; the eastern form, which 

 does not come regularly as far west as Colorado. 



l7la. American white-fronted goose. Anser albi- 

 FRONS gambeli. Rare migrant ; breeds far northward. 



