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THE RED-THROATED DIVER. 
Colymbus septentrionalis. 
PLATE XII. 
Colymbus septentrionalis, Limn. — Plongeon cat marin, ou a 
gorge rouge, Tetnm. — Red- throated Diver of British authors. 
— Speckled Diver, or Loon. — First and Second Speckled 
Diver of Bewick (the young). 
The Red-Throated Diver varies from those species 
which we shall immediately describe, and which we 
consider as more typical both in the less distinctly 
marked plumage and in the form of the bill, which in 
this bird appears slightly turned up, but this is caused 
by the mandible having a more marked ascending 
angle, the maxilla in reality bending as much as in 
the others. From the different appearance of the 
young and of the birds in winter, there for a long 
time existed a confusion, and the birds in that state 
were described as the “ Speckled Diver.” The grey 
head and rufous throat we consider to be the plu- 
mage of the breeding -time, lost when that is over, 
and only regained late in winter or on the approach 
of spring. This, however, in regard to the Red- 
throated Diver, still requires attention ; red-throated 
birds are got in “ winter,” (the months are not 
