POMERINE SKUA. 



629 



all round, and the breast yellowish-white, with the central 

 tail-feathers elongated, showing that the Pomarine Skurf 

 is subject to all the changes of plumage which have been 

 so frequently observed in the more common species next 

 to be described, and of which three representations are 

 given as illustrations. 



The two elongated central feathers of the tail are slightly 

 turned and pressed flatly together vertically when this 

 bird is on the wing ; the webs standing above and below 

 each shaft, and not laterally as is most usual. 



The name of Skua is considered to have been adopted 

 from the note of the bird, which sounds like skui. 



