BIEDS FROM SIAJVI AND THE MALAY PENINSULA 99 



Family LARIDAE: Gulls, Terns 



CHLIDONIAS HYBRIDA JAVANICA (Horsfleld) 



Sterna javanica Horsfield, Trans. Linn. Soc. London, vol. 13, p. 198, 1821 



(Java) . 



One male, Bangkok, May 27, 1926; one male and one female, 

 Bung Borapet, March 26, 1933. 



Gyldenstolpe ^^ records it as fairly common in the Inner Gulf of 

 Siam and along the coasts of southwestern and Peninsular Siam. 

 Robinson and Kloss *^ say they have examined many specimens in 

 W. J. F. Williamson's collection taken near Bangkok. 



The form ranges from Assam, Burma, Siam, and the Malay States 

 to Java, Celebes, and the Philippines, 



CHLIDONIAS LEUCOPTERA (Temminck) 



Sterna leucoptera Temminck, Manuel d'ornithologie, p. 483, 1815 (coasts of the 

 Mediterranean) . 



One female, Bangkok, May 25, 1926. 



Williamson *^ has taken it near Bangkok in February, April, and 

 October; Robinson *^ records it as common in Penang Harbor, March 

 1911 ; a large series was secured in the same place in October. 



This species can usually be distinguished from C. hybrida, even 

 when immature, by size alone and by having some black feathers in 

 the underwing coverts as a rule, but in the very young, where these 

 are lacldng, by the white upper tail coverts. 



The species breeds from southeastern Europe to central Asia and 

 migrates south in fall to India, Burma, China, the Malay Peninsula, 

 the Sunda Islands, and the Philippines. 



STERNA HIRUNDO TIBETANA Saunders 



Sterna tibetana Saunders, Proc. Zool. Soc. London, 1876, p. 649 (Tibet). 



One male and three females, Nakon Sritamarat, September 20, 

 1926. 



Two of these specimens are immature. I have no material in the 

 same stage of plumage with which to compare them. The adults 

 seem to belong to this form and presumably the two immatures do 

 likewise. 



This tern has been recorded by Robinson ^ from Pulo Terutau, 

 November 29. 



The form breeds in the inland waters of Ladak, Tibet, northwestern 

 Szechwan, and Turkestan and migrates to India, Burma, and the 

 Malay States. 



" Ibis, 1920, p. 770. 



<' Journ. Nat. Hist. Soc. Siam, vol. .'), p. 48, 1921. 



<' Journ. Nat. Hist. Soc. Siam, vol. 3, p. 37, 1918. 



" .lourn. Federated Malay States Mus., vol. 5, p. 17, 1913. 



•0 Journ. Federated Malay States Mus., vol. 7, p. 142, 1917. 



