230 Mr. H. Seebohm on the 



MERGUS SERRATOK. 



The Red-breasted Merganser is a very rare visitor. 



MERGUS ALBELLUS. 



The Smew is a common summer visitor, and breeds in 

 hollow willow trees. 



LARUS ICHTHYAETUS. 



The Great Black-headed Gull breeds in great numbers on 

 the Seal Islands and on other islands in the Caspian Sea. 



LARUS RIDIBUNDUS. 



The Black-headed Gull is very common, and breeds in the 

 Kirghiz steppes. 



LARUS TENUIROSTRIS. 



The Slender-billed Gull is very common. It breeds on a 

 salt lake on the Kirghiz steppes, and also on the Seal Islands. 



LARUS CACHINNANS. 



The Mediterranean Herring-Gull is common, but is not 

 seen on the steppes. 



LARUS CANUS. 



The Common Gull breeds in great numbers on the salt 

 lakes in the Kirghiz steppes. 



LARUS FUSCUS. 



The Lesser Black-backed Gull is very rare. ' 



LARUS GLAUCUS. 



The Glaucous Gull is only seen in immature plumage. 



STERNA CASPIA. 



The Caspian Tern breeds sparingly on the Seal Islands. 

 It is occasionally found in the river-district. 



STERNA ANGLICA. 



The Gull -billed Tern breeds in considerable numbers on 

 the Kirghiz steppes. 



STERNA CANTIACA. 



The Sandwich Tern breeds on the Seal Islands. 



STERNA HIRUNDO. 



The Common Tern is very abundant. 



