24 CHECK-LIST OF NORTH AMERICAN BIRDS. 
SuBORDER CEPPHI. Loons anp AUKS. 
Famity GAVIIDZs. Loons. 
Genus GAVIA J. R. Forster. 
Gavia Forster, Enchirid. Hist. Nat., 1788, 38. Based exclusively upon 
the Loons; type, by subs. desig., Colymbus imber GUNNERUS = C. 
immer BRUNNICH (Allen, 1907). 
Gavia immer (BRUNNICH). Loon. [7.] 
Colymbus immer Brinnicu, Orn. Borealis, 1764, 38. (Probably north- 
ern Norway.) 
Ranee.— Northern part of Northern Hemisphere. Breeds in 
America from Kotzebue Sound, Banks Land, Barrow Strait, and 
northern Greenland south to northern California, northern Iowa, 
northern Illinois (at least formerly), northern Indiana, northern Ohio, 
northern New York, Pennsylvania (casually), New Hampshire, Mass- 
achusetts (rarely), and Nova Scotia; winters from southern British 
Columbia, the Great Lakes, and southern New England to southern 
Lower California, the Gulf coast, and Florida. 
Gavia 4damsi (Gray). Yellow-billed Loon. [8.] 
Colymbus adamsit Gray, Proc. Zool. Soe. Lond., 1859, 167. (Alaska.) 
Rancr.— Circumpolar. Breeds from northwestern Alaska, north- 
ern Mackenzie, and Boothia Peninsula south to mouth of the Yukon 
and to Great Slave Lake; south in migration to Nushagak, Alaska; 
accidental in Colorado and Greenland; breeds also in northern Siberia 
and on islands north of Europe. 
Gavia arctica (LINN&us). Black-throated Loon. {[9.] 
Colymbus arcticus Linn.xus, Syst. Nat., ed. 10, I, 1758, 135. (Sweden.) 
Raner.— Northern part of Northern Hemisphere. Breeds from 
Kotzebue Sound, Alaska, west along northern coast of Siberia, on is- 
lands north of Europe, and from Cumberland Sound south to Ungava; 
