576 CLASS AVES. 



Black-headed Gull, Bonap. L. Atricella, Pall. Nov. 

 Com. Pet. XV. 22, 2. Gates. I. 89. Wilson's Am. 

 ix. 74, 4. 



Mantle, dark bluish-ash; quill, quite black; bill, 

 strong ; feet, dark-red ; tarsus, nearly two inches long ; 

 head, in summer, dark lead-colour ; young, brownish, 

 skirted with whitish and rusty ; tail, with a black sub- 

 terminal band. South America and Mediterranean, 



L. Leucopterus, Faber. L. Glau- 

 coides, Temm. L. Argentatus, Sabine. L. Arcticus, 

 Magellevray. 



Mantle, pale bluish-ash ; quills, greyish -white, white 

 at the point, reaching to the tip of the tail ; shafts, 

 pure- white ; head and neck, pure- white, in summer. 

 Arctic Circles. 



L. Cirrhocephalus, Vieill. Gal. 289, 

 or Poliocephalus, Lich. Neuwied Zool. Beitr. t. 



Head, throat, neck, and back, bluish-grey ; body 

 beneath, snow-white ; primary quills, black and white. 

 Brazils, Var, head, white. Gabiota Circicienta, 

 Azara. South America. 



White-eyed Gull. L. Leucophtalmus, Lich. Col. 

 366. 



Brown ; head, face, front of neck, tail, half-collar, and 

 lower part of the body, pure-white ; back, ash ; hood 

 and quills, black ; bill, red, black tipped ; feet, 

 orange. Red Sea. Length, sixteen inches ; wing, two 

 inches longer. 



Forked-tailed Gull. L. Sabinii Leach. Lin. Trans. 



12, t. 29. 

 Head and hind neck, dark-ash; breast and belly. 



