358 
EUROPEAN GULLS. 
Genus VIII. 
Sea swallow. Thalasseus. — Boje. 
1 Whitish gray sea swallow. Th. eaneseens, Brehm. 
2 Whitish sea swallow. Th. candicans, Brehm. 
Genus IX. 
Tern. Sterna. — Linn. Boje , and Brehm. 
1 Dougall’s tern- Sterna Dougalli, Mont. 
2 River tern. Sterna fluviatilis, Naum, and Brehm. 
3 Pomarine tern. Sterna pomarina, Brehm. 
4 Red-footed tern. Sterna hirundo, Linnaeus. 
5 Silver gray tern. Sterna argentata, Brehm. 
(! Silver coloured tern. Sterna argentacea. 
7 Long-tailed tern. Sterna macroura, Naum. 
8 Northern tern. Sterna arctica. Temminck. 
9 Nitches’ tern. Sterna Nitzsehii, Kaup. 
10 Short-footed tern. Sterna brachy tarsa, Graba. 
Genus X. 
Dwarf sea swallow. Sternula. — Boje. 
1 Cloven-footed dwarf sea swallow. Sterna fissipes, Brehm. 
2 Danish dwarf sea swallow. Sterna danica, Brehm. 
3 Pomarine sea swallow. Sterna pomarina, Brehm. 
Genus XI. 
Water swallow. Hydrochelidon. — Boje. 
1 Black water swallow. Sterna nigra, Boje. 
2 Blackish water swallow. Sterna nigricans, Brehm. 
3 Dusky water swallow. Sterna obscura, Brehm. 
4 Wliite- winged water swallow. Sterna leucoptera, Boje. 
49. CALYMBR1S GLACIALIS . — GREAT NORTHERN DIVER. 
“ These birds are numerous in the northern parts of 
the American continent. They arrive in the fur 
countries about the end of May, and retire to the south 
in October. They were frequently seen by Captain 
Franklin’s party during' their voyage on the Arctic 
Sea ; and Captain Carry received some of their skins 
from the Esquimaux who visited him. They breed on 
the shores of small lakes, laying two eggs at a time. 
Their cry is loud, has a peculiarly low and melancholy 
tone, and, when often repeated, is said to portend rain. 
The Canadian voyagers never fail to make a loud hoot- 
ing noise when this bird passes, for the purpose of 
rendering it, as they say, foolish. It is certain that it 
