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one inch ; tail short, rounded. Adult male with the head and neck 

 all round grayish-white, mottled with dusky; darker on the crown ; 

 upper parts black ; the feathers tipped with grayish-white, of 

 which color is the rump ; tail brownish-black ; wings of the same 

 color, their coverts white, forming a conspicuous patch on the 

 wings; lower parts white; feet vermilion. In summer, general 

 color of plumage black ; upper parts tinged with green — the lower 

 with brown ; the white patch on the wings same as in winter. 

 Length thirteen inches and a half, wing six and a quarter. 



The Black Guillemot is said to inhabit the Arctic seas of both 

 continents. Like the rest of this tribe, it lives almost entirely on 

 the water, and seldom resorts to the land, except for the purpose of 

 incubation, which Dr. Richardson informs us, is performed in the 

 holes of rocks, from whence it can easily throw itself into the 

 water. It abounds in the' Arctic seas and straits, from Melville 

 Island down to Hudson's Bay, and remains, though in diminished 

 numbers, all the Winter in the pools of open water which occur 

 ever in high latitudes, among the floes of ice. — Fauna Boreali 

 Americana, page 478. 



GENUS COLYMBUS — LINN. 

 DIVERS. 

 [Bill longer than the head, straight compressed ; stout, narrowed toward the 

 point ; head rather large, oblong, narrowed before — the feathers advancing on 

 the sides of the upper mandible as far as the nostrils ; neck rather long and 

 thick; body long, heavy, and depressed; wings small, narrow ; quills stiff; 

 tail very short, rounded; feet large, placed very far behind ; tarsi compressed.] 



COLYMBUS GLACIALIS— LINN. 



GREAT NORTHERN DIVER. 



Great Northern Diver, or Loon, Wilson. 



Colymbus glacialis, Bonapart. 



Colymbus glacialis, Great Northern Diver, Sw. & Rich. 



Loon, or Great Northern Diver, Nuttall. 



Great Northern Diver, or Loon, Colymbus glacialis, Audubon. 



Specific Character — Bill black, very strong, from the corner of 



the mouth to the point four inches and a half; length of tarsi three 



inches and three-eighths. Adult with the bill black ; head and 



neck dark green, with blue and purple reflections, and longitudinal 



