Sabine's Gull 



regions of North America, whence it migrates southwards, in 

 winter. 



The adult has a slate grey back ; the head and neck are 

 very dark grey, tail and under parts white. In winter the 

 forehead and crown are white. In their first autumn the 

 young are ash grey on the occiput, nape, and back. The 

 tail feathers have broad black tips. Length 1 3 in. ; wing 

 10-75 in. 



This species may always be recognised by the forked 

 tail. 



THE WEDGE-TAILED GULL 



Rhodostethia rosea, Macgillivray 



This extremely scarce Arctic Gull is said to have been 

 obtained in Yorkshire on one occasion. It may be recognised 

 by the wedge-shaped tail. 



The adult is grey on the mantle ; the rest of the plumage, 

 except for a narrow black ring round the neck, is pure 

 white. Length 13-5 in.; wing 10*25 in. 



BONAPARTE'S GULL 



Larus Philadelphia (Ordigny) 



This is a common North American species, of which some 

 three examples have been taken in the United Kingdom. 

 In summer the adult has the head and neck black ; 



359 



