ON THE MIGRATION OF BIRDS. 391 



any of them, excepting of the lesser Guillemot 

 and black-billed Auk, which, during winter, 

 visit in vast flocks the Frith of Forth. 



These chiefly breed in the lakes of Szvedeii Divers. 

 and Lapland, and some in countries nearer the 

 Pole;* but some of thef red throated Divers, 

 the tiorthern and the irnber, may breed in the 

 north of Scotland and its isles. 



I am uncertain where the black toed Gull Gulls. 

 breeds. The Skua is confined to the Shetland 

 Isles, the Rock Foula, and perhaps Si. Kilda. 

 The Arctic breeds in the Orknies and in the 

 Hebrides. The rest of the tribe breed dispers- 

 edly on all the clifls of Great Britain. The 

 black headed on our fens and lakes. 



Every species:]: breeds here; but leaves us in Terns. 

 the winter. 



The Fulmar breeds in the isle of ^S*^. Kilda, Petrels. 



and continues there the whole year, except Sep- 



tember and part of October ; the Shearwater 



. . . ' 



visits the Isle of Man in April, breeds there, 



and leaving it in August or the beginning of 

 September, disperses over all parts of the At- 

 lantic Ocean. The Stornifinch is seen at all 



* Faun. Suec. No. 150. Crantz, Greenl. I. 82. 83. 



•\- Barry, in his History of the Orkneys, p. 304, says that this 

 species builds on a bank of a lake in Hoy, and in other places. 

 Ed. 



X The Sandwich Tern may perhaps be an exception. Ed. 



