no THE BIRDS OP MONGOLIA ETC. 



on Lake Dalai-nor ; \Yhilst on the other lakes of Mongoha they appeared to 

 be rather scarce. 



Many were in their winter plumage even as late as March ; i. e. they 

 had at that time a white head. They breed plentifully on the lakes of the 

 Iloang-ho valley. At Koko-nor the earliest migrants appeared on the 6th 

 of March ; and afterwards, from the 20th of the same month, they were 

 abundant, but not so numerous as the preceding species. 



In Ussuri country the closely allied species of Chroicocephalus ridihundus 

 is very abundant. It commences to arrive at Lake Hanka about the middle 

 of March ; but the principal migration takes place early in April. These 

 Gulls can be seen, high up in the clouds, flying in a northerly direction in 

 small flocks, or even singly. On the coasts of the Japanese Sea I often met 

 with C. ridihundus in October and November, and saw a few wintering birds 

 in December at St. Olga. 



285. Sterna anglica, Mont. Kratchka chernonosaya. 



Inhabits Mongolia, Ordos, and Ala-shan, and breeds in the two latter 

 localities — i. e. in the Hoang-ho valley on Lake Urgun-nor, and in Southern 

 Ala-shan on a small marsh, Bayan-bulik. It does not occur in the Ussuri 

 country, and has not been observed in China proper. 



[To BE CONTINUED.] 



