ICELAND GULL. 



649 



streaks ; primaries white ; tail- coverts and tail-feathers 

 greyish-white, the latter marked across with broadish lines 

 of pale brown, which are more numerous about the base 

 than towards the end ; chin dull white ; neck, breast, belly, 

 and all the under surface of the body, dull white, streaked 

 transversely with pale brown ; legs yellowish-brown. 



The markings on the feathers are gradually lost in the 

 successive moults, the same phases being passed through 

 as those already noticed in the Glaucous Gull ; and by the 

 fourth summer the adult plumage has been assumed. 



VOL. III. 



4 o 



