BLACK GUILLEMOT. 383 



ALCA GKYLLE. 

 BLACK GUILLEMOT. 



(Platk 45.) 



Uria minor, ~) 



Uria minor nigra, > Briss. Orn. vi. pp. 7l>,, 76, 76 (1700). 



Uria minor striata, J 



Colymbus grjile, Linn. Si/sf. Nat. i. p. 220 (1766) ; et auctorum plurimorum— 

 (Latham), GmeJin, {Te?n7mnck), {Naumann), {Dresser), {Saunders), &c. 



Cepplius lacteolus, Pall. Spieil. Zool. pt. v. p. 83 (1769). 



Mergus troile, Tunst. Orn. Brit. p. 3 (1771, nee Linn.). 



Coh-mbus g-rylliis (Linn.), O. F. 3IiiU. Zool. Dan. Prodr. p. 18 (1776). 



Coljmibus lacteolus (Pall.), Gmel. Syst. Nut. i. p. 583 (1788). 



Uria grylle (Linn.), \ -r -, ^ ■, ^ 



Uria lacteola pJ.), ( ^"'''- ^"^- ^'-^ "" PP' '""' ' '^^ (l^^^)" 



Uria nivea, Bonn. Encycl. Method, i. p. 37 (1790). 



Uria leucoptera, Vieill. N. Diet. d'Hist. Nat. xiv. p. 35 (1817). 



XJriH '^cxi^ulfiris / 



G '11 1 '^•' ( ^^^^^^' ^^^'^"'^ ^^^- '^^*^^- ^"- P*- 2' PP- -'^0, 252 (1824). 



Cephus grylle (Linn.), Brehm, Vog. Deutschl. p. 987 (1831). 

 Grylle groenlandicus, Gray, List Gen. B. p. 77 (1840). 

 Uria groenlandicus, Gray, List Gen. B. p. 98 (1841). 



The stronghold of the Black Guillemot in Great Britain is the west 

 coast of Scotland, including the Hebrides, Orkneys, and Shetland. It is 

 not known to breed with certainty on the east coast of Scotland south of 

 Sutherland. In Pennant^s day it was said to breed on the coast of Wales, 

 but is not known to do so now, although it still breeds sparingly in the 

 Isle of Man. In Ireland it has deserted some of its former breeding- 

 placeSj but still has colonies on the north coast. It occasionally wanders 

 southwards in autumn, and has been known to range as far as Sussex, 

 Devonshire, and Cornwall. It is only found inland accidentally after severe 

 weather. 



The Black Guillemot is a circumpolar species, which may be separated 

 into two races — an Atlantic form Avitli a subarctic distribution, and an 

 Arctic Ocean form with an Arctic distribution. It is not known that 

 these forms intergrade; but as they only differ in the amount of white on 

 the wing-coverts, in precisely the same way as Alca columba differs from 

 A. motzfeldi, the fact that the two latter species intergrade is j)re- 

 sumptive evidence that the two forms of the Black Guillemot do so 

 also. The Arctic form breeds on the coasts of Nova Zembla_, Franz- 



