208 PODICIPIN-&. COLYMBUS. 



cially are met with from one end of the island to the other. 

 In summer it betakes itself to the Arctic regions. The nest 

 is large and rude ; the eggs, generally three, are considerably 

 elongated, three inches and three-fourths in length, two inches 

 and a fourth in breadth, dull yellowish green spotted with 

 dusky. The flesh is dark and unsavoury, the skin sometimes 

 used for caps. 



Great Northern Diver. Greatest Speckled Diver. Im- 

 mer, Emmer, or Imber Goose. Gunner. Naak. Cobble. 



Colymbus glacialis, Linn. Syst. Nat. i. 221, adult, Colym- 

 bus Immer, young, i. 222. Colymbus glacialis and Immer, 

 Lath. Ind. Ornith. ii. 799, 800. Colymbus glacialis, Temm. 

 Man. d'Ornith. ii. 910. Colymbus glacialis, King-necked 

 Loon, MacGillivray, Brit. Birds, v. 



277. COLYMBUS ARCTICUS. BLACK-THROATED LOON. 



Adult about two feet and a half long ; with the bill black, 

 nearly straight, two inches and a half in length along the 

 ridge, with the sides convex beyond the nostrils, the edges 

 involute for half their length in the middle ; the fore part 

 and sides of the head and throat, and the sides of the neck, 

 light bluish-grey ; the upper plumage glossy bluish black, 

 tinged with green anteriorly ; on the fore part of the back two 

 longitudinal bands of transverse white bars ; the scapulars 

 with large square white spots : upper part of fore-neck pur- 

 plish black ; sides of neck dusky, streaked with white ; on 

 the lower part of the neck a broad space streaked with dusky 

 and white ; lower parts white, with a longitudinal dusky band 

 under the wings. Young in winter with the bill bluish-grey, 

 dusky on the ridge ; upper parts of head and hind-neck grey- 

 ish-brown, sides of head greyish-white ; upper parts of body 

 blackish-brown, the feathers edged with pale grey; lower 

 parts white, the sides and lower tail-coverts greyish- or own. 



Male, 29, 40, 12, 2, 3 T V, 3 T \, 5. Female, 27, 38. 



This species is of very rare occurrence, so that specimens 

 are with difficulty procured. It has, however, been found 

 breeding in the Hebrides and the extreme north of Scotland. 

 It is generally dispersed over the northern parts of Europe 

 and America, but appears to be everywhere less common than 

 the other two species. The eggs, two or three, are three 

 inches long, two in breadth, olivaceous, spotted with dusky. 



Colymbus arcticus, Linn. Syst. Nat. i. 221. Colymbus 

 arcticus, Lath. Ind. Ornith. ii. 800. Colymbus arcticus, 

 Temm. Man. d'Ornith. ii. 913. Colymbus arcticus, Black- 

 throated Loon, MacGillivray, Brit. Birds, v. 



