4 CHECK-LIST OF NORTH AMERICAN BIRDS. 
8. Urinator adamsii (Gray). 
Yellow-billed Loon. 
Colymbus adamsii GRAY, P. Z. S. 1859, 167. 
Urinator adamsii STEJN. Pr. U. S. Nat. Mus. V. 1882, 43. 
[B—, C 605a, R 737, C 841. ] 
Geoc. Dist.— Arctic America, west of Hudson Bay, and north- 
eastern Asia. Casual in northern Europe. 
9. Urinator arcticus (LINN.). 
Black-throated Loon. 
Colymbus arcticus LINN. S. N. ed. to, I. 1758, 135. 
Urinator arcticus STEJN. Pr. U. S. Nat. Mus. V. 1882, 43.- 
[B 699, C 606, R 738, C 842.] 
Groc. Dist.— Northern part of the northern hemisphere. In 
North America of casual occurrence in autumn and winter in the 
northern United States east of Rocky Mountains. 
10. Urinator pacificus (Lawr.). 
Pacific Loon. 
Colymbus pacificus LAwWR. in Barrp’s B. N. Am. 1858, 889. 
Urinator pacificus STEJN. Pr. U. S. Nat. Mus. V. 1882, 43. 
[B 700, C 6062, R 739, C 843.] 
Geoc. Dist.— Pacific coast of North America, south in winter to 
Cape St. Lucas and Guadalupe Island. 
11. Urinator lumme (Gunv.). 
Red-throated Loon. 
Colymbus lumme GuNN. Trond. Selsk. Skr. I. 1761, pl. ii. fig. 2. 
Urinator lumme STEJN. Pr. U.S. Nat. Mus. V. 1882, 43. 
[B 701, C 607, R 740, C 844.] 
Geoc. Dist.— Northern part of northern hemisphere, migrating 
southward in winter nearly across the United States. 
