432 TEN YEARS IN SWEDEN. 



green-brown, spotted with black, and very similar in the 

 different species except in size. 



291. COLYMBUS GLACIALIS, L, Is Lorn. The Northern 



Diver. D. F. 



Beak straight, 3 in. long from forehead; convex, alike 



on both mandibles ; suture of the beak quite straight ; 



length of male about 2 ft. 9 in. ; beak from gape 4 in. 



3 1. ; height over nostrils 1 in. ; tarsus 3 in. 3 1. ; outer 



toe 4 in. 6 1. ; tail 2 in. 5 1. ; carpus 15 in.- 



Summer : beak black, paler at the tip ; legs, outwardly 



dark brown, inwardly whitish ; head and neck black, with 



a green and purple tint ; two patches of white and black 



bars, on the sides of the neck ; back, shoulders, wings, and 



all the upper parts, glossy black, strewed with white spots, 



those on the shoulders large and square, on the wing coverts 



and hinder parts, small, fewer, and round; breast and 



belly pure white. 



The female is smaller. 



In winter and when young in which plumage it is always 

 obtained in Southern seas, and called the irnber : head, 

 back of neck, and ^all the upper parts, grey-brown, with 

 broad ash-blue edges to the feathers on the back and 

 shoulders ; throat, cheeks, neck in front, and all the lower 

 parts, white, but in the younger birds, spotted with grey 

 in front of the neck ; beak is also paler. 



Is only an occasional winter visitant to these coasts, and 

 I believe was never known to breed in Scandinavia. 



292. C. ARCTICTJS, L. Stor Lorn. The Black-throated 



Diver. D. F. 



Beak above rather more convex than below; the 

 beak suture, rather curved ; beak from forehead 

 2 in. -f- 1. ; carpus 13-^- in. ; length of the male about 

 2 ft. 4 in. ; beak from gape 4 in. ; tarsus 3f in. ; 

 tail 2| in. 



Summer : beak black ; head and back of neck ash grey ; 

 throat and neck in front, violet black ; above the top of the 

 throat, in front, is a transverse row of small white spots ; 



