BIRDS OF THE BRITISH ISLES. 365 



and wing-coverts, dark grey; secondaries, tipped broadly 

 with white; first quill, white, with a narrow band of black 

 on outer web and a patch of black on inner web ; next 

 three primaries, with subterminal bars of black and white 

 tips; remainder of plumage, white; a small white patch 

 behind the eye; irides, deep brown; bill, rich yellow, black 

 and red at the angle; legs and feet, greenish-yellow; webs, 

 orange. Length of male, about twenty-seven inches. 



flDefctterranean Blacfc-beafcefc (Bull. 



THE Mediterranean Black-headed Gull (Larus melano- 

 cephalus, Natterer) is an exceptionally rare abnormal winter 

 migrant to the British Isles, and inhabits the South-western 

 Palearctic Region. The adult in summer has the head 

 black; secondaries and wing-coverts, pearl-grey; primaries, 

 white, excepting the first quill, which has a black line on 

 outer web; rest of plumage, white; irides, brown; bill, 



