234 NORTHERN DIVEH. 



YOUNG. Colymbus Immer. Linn. Syst. Nat. I. 222. Gntel. 



Syst. Nat. 1. 588. Lath. Ind. Orn. 2. 800. 

 Mergus major. Briss. Orn. 6. 105.jp. \Q.f. 1. 

 Colymbus maximus Gesneri. Rail, Syn. 126. 

 Le Grand Plongeon. Buff. Hist. Nat. Ois. 8. 251. 

 Imber Diver. Penn. Brit. Zool. 2. 238. pi 84. Pom. Arct. 



Zool 2. 440. Lath. Gen. Syn. 6. 340. Wale. Syn. 1 . pi. 99. 



Don. Brit. Birds. 5. pi. 99. Lew. Brit. Birds, 6. pi. 227. 



Mont. Orn. Diet. 1. Beiv. Brit. Birds, 2. 185. 



LENGTH of the mature bird about thirty-two inches: 

 its beak is black, with its tip ash-coloured : irides 

 brown : the head, throat, and neck are greenish-black, 

 glossed with green and bluish : beneath the throat is 

 a small transverse band, which is rayed with white 

 and black : on the hinder part of the neck is a broad 

 collar longitudinally rayed with black and white : the 

 back, wings, sides, and rump are deep black ; with 

 each feather of the back and scapulars marked at the 

 tip with two square white spots : the wing-coverts, 

 sides, and rump are sprinkled with small white spots : 

 the breast and under parts are pure white : the legs 

 are dusky brown externally and whitish internally. 

 The young differ considerably from the old : they 

 have the upper mandible of the beak of a greyish- 

 ash, and the under whitish : the irides brown : the 

 head, occiput, and all the hinder part of the neck, 

 of an ashy-brown ; with small grey and white spots 

 on their cheeks : the throat, fore part of the neck, 

 and the rest of the under parts of a pure white : the 

 feathers of the back, the wings, rump, and sides are 

 deep brown in the middle, edged and tipped with 

 bluish-ash : the legs are deep brown externally and 

 whitish internally. After the first year they possess 



