GAVi^. 289 



Richardson's Skaa probably breeds on the Kurile Islands, whence 

 examples have been brought by Mr. Snow (Blakiston and Pryer, 

 Trans. As. Soc. Japan, 1882, p. 105). There are three examples in 

 the Pryer collection from the Kurile Islands, all of them belonging to 

 the dark form with no white on the underparts. 



Richardson's Skua is a circumpolar species, and frequently visits 

 the British Islands on its migrations, a few breeding in Scotland. 



283. STERCORARIUS BUPFONI. 

 (BUFFON^S SKUA.) 



Lestris huffoni, Boie, Isis, 1822, p. 562. 



Buifon's Skua closely resembles Richardson's Skua, but it is not 

 known ever to have dark underparts. The central tail-feathers are 

 4 to 8 inches longer than the others, and only the first and second 

 primaries have white shafts. 



Figures : Gould, Birds of Great Britain, v. pi. 81 ; Dresser, Birds 

 of Europe, iii. pi. 612. fig. 1. 



Bufibn's Skua probably breeds on the Kurile Islands, whence 

 examples have been brought by Mr. Snow (Blakiston and Pryer, 

 Trans. As. Soc. Japan, 1882, p. 105) . 



BuiFon's Skua is a circumpolar species, and occasionally visits the 

 British Islands on its migrations. 



284. STERCORARIUS POMARINUS. 

 (POMARINE SKUA.) 



Lestris pomarinus, Temminck, Man. d'Orn. p. 514 (1815). 



The Pomarine Skua differs from its allies in having broad, rounded 

 and twisted central tail-feathers. 



Figures : Gould, Birds of Great Britain, v. pi. 79 ; Dresser, Birds 

 of Europe, viii. p. 610. 



The Pomarine Skua is an occasional winter visitor to Japan (See- 

 bohm, Ibis, 1884, p. 32). There is an example in the Pryer collection 

 from Tokio Bay. 



The Pomarine Skua is a circumpolar species, and frequently visits 

 the British Islands in winter. 



u 



