NATATORES. 475 



Dimensions. 



Inch. Lin. Inch. Lin. Inch. Lin. 



Length, total . 36 Length from nostrils to tip . 2 3 Length of outer nail . 5 



„ of tail . .40 „ of tarsus . .38 ,, of hind toe . .0 9 



„ of wing 14 3 „ of middle toe .44 „ of hind nail . 3 



„ of bill above . .31 „ of middle nail . 7 Extent of wing . . 48 

 „ of bill to rictus .46 „ of outer toe . 4 8 



Specimens in mature plumage vary considerably in total length, upwards of an inch in the 



length of wing, and more than half an inch in the length of the tarsus. — R. 



[233.] 2. Colymbus arcticus. (Linn.) Black-throated Diver. 



Genus, Colymbus, Linn. 



The Speckled Diver or Loon. Edw., pi. 146 ; mature Hudson's Bay specimen. 



Black- throated Diver. Penn. Arct. ZooL, ii., p. 520, No. 444. 



Plongeon lumme, ou a gorge noire {Colymbus arcticus). Temm., ii., p. 913. 



Colymbus arcticus {Black-throated Diver). Richards. App. Parry's Secojid Voy., p. 376. 



Bonap. Syn., p. 420, No. 369. 

 Moqua, Cree Indians. Loon, Hudson's Bay Residents. 



A specimen of this bird, brought from Hudson's Bay by Mr. Isham, is well 

 figured by Edwards ; and several specimens were recently brought home by Sir 

 Edward Parry from the coast of Melville Peninsula, which agreed in all respects 

 with others from the north of Europe. The Black-throated Diver is common on 

 the shores of Hudson's Bay, but is rarely seen in the interior. The skins of this 

 and the other species of Diver, being tough and impervious to wet, are used by 

 the Indians and Esquimaux as an article of dress. 



DESCRIPTION 

 Of a specimen killed, June 28, 1822, on Melville Peninsula. 



Colour. — Forehead, back, wings, tail, flanks, and thigh feathers, black; the scapulars and 

 shoulders marked with transverse white marks, and the wing coverts with round dots. Hind 

 head and back of the neck ash-coloured ; sides of the latter and of the breast white, streaked 

 with black ; fore part of the neck black, reflecting purple and green ; the under tail coverts 

 barred with black ; rest of the under plumage white. Length, total, 26 inches ; of wing, 

 11 inches ; of bill, 31 inches. Weight, 5 pounds. 



The young closely resemble those of C. glacialis, but may be distinguished by their 

 inferior size, a slight curvature of the upper mandible, and the want of a groove on the under 

 one, which is not thickened in the middle. — R. 



3 P 2 



