301 



COLYMBUS SEPTENTRIONALIS. THE RED- 

 THROATED LOON. 



RED-THROATED DIVER. SPECKLED DIVER. SPRAT LOON. 



Colymbus septentrionalis. Linn. Syst. Nat. I. 220. 



Colymbus septentrionalis. Lath. Ind. Ornith. II. SOL 



Colymbus borealis, striatus, and stellatus. Lath. Ind. Ornith, II. 800, 801, 



802. Young. 

 Red-throated Diver. Mont. Ornith. Diet, and Supplt. 

 Speckled Diver. Mont. Ornith. Diet, and Supplt. 

 Plongeon cat-marin ou a gorge rouge. Colymbus septentrionalis. Temm. 



Man. d'Ornith. II. 916. 

 Red-throated Diver. Colymbus septentrionalis. Selby, Illustr. II. 414. 

 Colymbus septentrionalis. Eed-throated Diver. Jen. Brit. Vert. Anim. 

 Colymbus septentrionalis. Bonap. Comp. List. 65. 



Adult about two feet jive inches long ; with the billhluish- 

 hlach, slightly curved upivards, two inches and a third along 

 the ridge, two-thirds of an inch in height at the base, loith the 

 sides prominent, the edges 7nuch inflected ; the sides of the 

 head and neck, loith the throat bluish-grey , the iq^per part of 

 the head marked with small dark spots, the 7iaj>e, hind and 

 lower parts of the neck streaked with black and white, the fore 

 part of the neck with a broad longitudinal band of deep 

 orange-red ; the upper parts greenish-blacli, loithout spots ; the 

 lower white, but the sides greyish-black, and a narrow dark 

 grey band across the hind part of the abdomen. 



Male in Summer. — The Red-throated Diver, which is 

 considerably less than the Black-throated, and readily distin- 

 guished from it by the difference in the form of its bill, inde- 

 pendently of its colouring, which is very dissimilar, has the 

 body elongated, rather slender, and considerably depressed ; 

 the neck long and rather thick ; the head of moderate size. 



