LAEUS. 



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234. Lanis fuscus. The Lesser Black-backed Gull. 

 (J 22". Legs yellow. Bill yellow, angle red. Head, neck, tail, and below 

 white. First quill with white mirror ; second with smaller white mirror. Bases 

 of quiUs lead colour, tips white. On third quill grey wedge becomes visible, and 

 increases to the seventh. The other quills lead colour with white tips. — In winter: 

 Head and neck streaked dusky brown. N. Europe and Mediterranean, ranging 

 south in winter to Canaries, Egypt, Eed Sea, and Persian Gulf. (J. 978.) 



L. occidentalis. 21" to 22". Legs yellow. Bill yellow, angle red. Head, neck, tail, and 

 below white. Mantle darker than in L. affinis. All primaries tipped white. First, second, 

 and third quills chiefly black, with white mirror on first, and a white spot on the second. No 

 grey on inner webs of outer quills. Pacific coast of N. America. 



L. schistisagus. 24" to 25"- Legs grey. Bill yellow, with red spot at angle. Head, neck, 

 tail, and below white. Mantle darker than in L. affinis. All primaries with white tips. The 

 first quill for more than 2" crossed by narrow dark bar ; the second with white subterminal 

 spot on outer web, and a patch of white on inner ; third quill transversely barred blackish 

 brown. Inner webs of outer quills grey. Behring Sea to N. Japan. 



Mantle deep sooty black. 

 L. ma/rinus. 28" to 30". The Great Black-backed Gull. Legs flesh colour. Bill yellow, 

 angle red. Remiges thirty-four. All quills broadly tipped white. First quill white for nearly 

 3" ; second quill with large mirror and with black spot on inner web. — In winter : Crown and 



