IYOKY GULL 451 



with black, below which is a greyish portion, followed by 

 a broader black neck-band ; inner secondaries and some of 

 the wing-coverts, dappled with brownish-black ; first four 

 primaries, blackish on the outer and on part of the inner 

 webs ; tail, broadly banded terminally with blackish-brown. 



BEAK. Greenish-yellow. 



FEET. Blackish ; hind-toe, extremely small. 1 



IRIDES. Blackish-brown. 



AVERAGE MEASUREMENTS. 



TOTAL LENGTH ... ... ... 15'5 in. 



WING 12 



BEAK 1-75 



TARSO-METATARSUS 1*4 ,, 



EGG ... 2-15x1-6 in. 



Allied Species and Representative Forms. R. brevirostris 

 of Brandt, has orange-red feet and darker back and wings 

 than our bird. It is found between Alaska and Kamtschatka. 



IYORY GULL. Pagophila eburnea (Phipps). 



Coloured Figures. Gould, Birds of Great Britain,' vol. v, pi. 

 62 ; Dresser, ' Birds of Europe,' vol. viii, pi. 595 ; Lilford, 

 ' Coloured Figures,' vol. vi, pi. 30. 



The first recorded British specimen of this Gull was 

 taken in the winter of 1822 in the Shetland Islands. The 

 capture was made known by the late Dr. L. Edmonston, in 

 a paper read before the Wernerian Society of Edinburgh. 

 The bird was presented to the Edinburgh Museum (Bewick, 

 ' British Birds '). Several examples have since been secured 

 from the same Islands, as well as from the Orkneys and 

 the Outer Hebrides. 2 



On the mainland of Scotland the bird has been recorded 



1 The hind-toe is better developed in some of the Kittiwakes which 

 frequent Behring Sea, though this variation is not necessarily pre- 

 scriptive of northern races. Even in the same individual the hind-toe 

 may vary considerably in development. 



- This Gull was added to the ' Fauna of the Outer Hebrides,' by 

 the late Mr. Buckley, who recorded a specimen from Stornoway, 

 January, 1890 (Harvie-Brown, ' Avifauna Of The Outer Hebrides,' 1888- 

 1902; Ann. Scot. Nat. Hist., 1903, p. 16). 



