BLACK-THROATED DIVER. 
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legs, feet, and bill, pale ; theunder plumage, sides, and 
flanks, pure -white ; the head and back of the neck 
pale grey; the back brown, having the feathers 
broadly edged with grey, quills blackish brown. The 
downy plumage of the young, soon after hatching, is 
greyish black, paler beneath. 
Some of the continental ornithologists consider 
that there are two nearly allied species of Black- 
throated Divers, giving to the one the title of “ arc- 
ticus," to the other that of “ ba l t ic us we are not 
at present aware of the distinctions which are con- 
sidered to separate them, but a specimen from 
Northern Europe, which we had for a short time 
in our possession, and before we were aware of the 
continental opinions, appeared to us considerably 
less in size, and the gular patch terminated inferiorly 
in a curved outline, not in a peak or angle as in 
the British specimens. Wo now mention this to 
call the attention of our ornithologists to the proba- 
bility of there being two species of this beautiful 
Diver confounded. 
C. arcticus. C. balticus. 
Great Northern Diver, Colymbus Glacialis. 
— Colymlus glacialis, Linn., — Plongeon Im- 
