The Distribution of Birds in Great Britain. 459 



COLYMBUS SEPTENTRIONALIS (Linn.}. Red-throated Diver. 



Provinces XV .-XVIII. 



Subprovinces 31, 32, 34-38. 



Lat. 56-61. " Scottish " type. Not in Ireland. 



With much the same range as the former species, the Red-throated 

 Diver appears to be the more frequent of the two, and extends to 

 Shetland. 



Mr. St. John mentions Loch Endorb, in Morayshire, as a locality 

 for the nest. 



Obs. Colymbus glacialis. Mr. W. Dunbar tells me that once, 

 when a boy, he saw a pair of Great Northern Divers, with one young 

 one, on Loch Endorb. On the same loch were two or three pairs of the 

 Black-throated Diver ; so that the two species were easily distinguished 

 by the great disparity of size. 



Dr. Saxby writes that he has procured from Yell, in Shetland, some 

 eggs which he considers to belong to the Great Northern Diver ; but I 

 fear that the eggs alone are not to be relied upon, as Mr. R. Gray has 

 seen eggs about as large as those of the Great Northern Diver, and 

 very much resembling them in shape, which were taken from a Black- 

 throated Diver shot on its nest. The last-named species, however, 

 does not breed in Shetland, as Dr. Saxby has lately remarked (Zool. 

 p. 2525). 



Messrs. Baikie and Heddle inform us that in Orkney the Great 

 Northern Diver has been seen during summer on moors at a distance 

 from the sea ; but, as yet, the fact of its breeding in any part of the 

 British Islands seems to need positive proof. 



URIA TROILE (Lath.}. Common Guillemot. 



Provinces I.-III. [IV.] VI. VII. X.-XVIII. 

 Subprovinces 1-7, (11), 17, 18, 22, 24-28, 30-38. 

 Lat. 50-61. " British " type, or general. 



Formerly the Guillemot used to breed in the cliffs at Hunstanton, in 

 Norfolk. 



The variety which has been distinguished under the name of Ringed 

 Guillemot ( U. ringvid] appears to occur more frequently in the northern 

 counties. It is returned as breeding on Lundy Island, the coasts of 

 Wales and Yorkshire, the Farn Islands, Ailsa, the Bass Rock, in 

 Aberdeen, Banff, Caithness, and in all three groups of isles, and is 

 probably to be met with in most other localities where the Common 

 Guillemot is numerous. 



Obs. Briinnich's Guillemot (U. bruennichi} is included by Sir W. 

 Milner in his List of the Birds of Sutherland, published in the ' Zoolo- 

 gist ' ; but Mr. Henry Milner has kindly informed me that the bird was 

 not found breeding there, and only a single specimen was purchased on 

 that occasion. 



