edhead.= AYTHYA AMERICANA. Common migrant; breeds far north;
migrates early in spring.

147. =Canvas-back.= AYTHYA VALLISNERIA. Migrant; not common; breeds far
north.

148. =Scaup duck.= AYTHYA MARILA. Rare migrant; both sides of the range;
breeds far north.

149. =Lesser scaup duck.= AYTHYA AFFINIS. Migrant; not common; a little
more common than preceding.

150. =Ring-necked duck.= AYTHYA COLLARIS. Rare migrant, though common in
Kansas; breeds in far North.

151. =American golden-eye.= CLANGULA CLANGULA AMERICANA. Rare migrant;
breeds far north.

152. =Barrow's golden-eye.= CLANGULA ISLANDICA. Summer and winter
resident; a northern species, but breeds in mountains of Colorado,
sometimes as high as 10,000 feet; rare on plains.

153. =Buffle-head.= CHARITONETTA ALBEOLA. Common migrant throughout
State; breeds in the North.

154. =Old squaw.= HARELDA HYEMALIS. Rare winter visitor; a northern
species.

155. =Harlequin duck.= HISTRIONICUS HISTRIONICUS. Resident; not common;
a northern species, but a few breed in mountains at an altitude of 7,000
to 10,000 feet.

160. =American eider.= SOMATERIA DRESSERI. Very rare; only two
records--one somewhat uncertain.

163. =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 observations given in Chapter VII.

169. =Lesser snow goose.= CHEN HYPERBOREA. Migrant and winter resident;
not common; breeds far north.

169a. =Greater snow goose.= CHEN HYPERBOREA NIVALIS. Rare migrant; only
two records; the eastern form, which does not come regularly as far west
as Colorado.

171a. =American white-fronted goose.= ANSER ALBIFRONS GAMBELI. Rare
migrant; breeds far northward.

172. =Canada goose.= BRANTA CANADENSIS. Summer and winter resident;
rare, except locally; common in migration; breeds about secluded lakes
at 10,000 feet.

172a. =Hutchins's goose.= BRANTA CANADENSIS HUTCHINSII. Common migrant;
breeds in the North; a few may winter in the State.

172c. =Cackling goose.= BRANTA CANADENSIS MINIMA. One record; Pacific
coast bird; breeds in Alaska.

173. =Brant