BLACK-THROATED DIVER. 195 



legs, feet, and bill, pale; the under 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 " lalticus " 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 consideiably 

 less in size, and the gular patch terminated inferiorly 

 in a curved outline, not in a peak or angle as in 

 the British specimens. We 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. balticus. 



GREAT NORTHERN DIVER, COLYMBUS GLACIALIS. 

 Colymlus glacialis, Linn., fyc. Plongeow Im- 



