on the Birds of South-eastern China. 377 



Sterxa sinensis. 



The Chinese Ternlet occurs, as a rule, during both the 

 autumn and spring migi-atious, and chiefly confines itself to 

 the tidal portions of tlie rivers. 



The birds are usually single, but flocks of as many as 

 twenty do occur, and they have been noted quite ninety 

 miles away from the sea. They fish over the marsh-land 

 in the same way as White-winged Black Terns, with which 

 they are often associated. 



GyGIS CANDIDA. 



This Tern was only observed on one occasion ; this was 

 at Macao on September 20, 1905, when a small flock 

 frequented the harbour for three days, during a strong blow 

 from the north-east. 



Lauus saundersi. 



Tliis Black-headed Gull has twice been noticed ; on March 

 16, 1904-, about a dozen individuals were seen about half-way 

 between Kong j\Iun and Samshui, on the spring migration, 

 and in September 190G, at Macao, a specimen was brought 

 to Mr. J. C. Kershaw. 



Larus ridibundus. 



The Black-headed Gull occurs in considerable numbers 

 from the third week in October until February or March, and 

 unlike Lai'us conw* frequents the West River for many miles 

 inland ; it has been seen in November at Tulok, 190 miles 

 from the sea. 



On September 9 an immature bird of this species was 

 seen at Moto; an unusually early date. Like other Gulls, 

 its numbers seem to depend to some extent on the kind of 

 winter weather which obtains. 



Larus crassirostris. 



The Bar-tailed Gull is a not infrequent visitor to the 

 Kwang Tung coasts in the months of January, February, 

 and March, when it associates freely with Larus canus and 

 Larus cachinnans : it does not usually come into Hong Kong 



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