BIRDS FROM SIAM AND THE MALAY PENINSULA 471 



This form has not been recorded from Siam before, unless the speci- 

 men that was recorded by Williamson * from Bangkok as Motacilla 

 leucopsis, and that Robinson and Kloss ^ think is dukhuensis, belongs 

 to this race, which I think is most likely. 



M. a. baicalensis breeds from northern Manchuria to Lake Baical 

 and south to northeastern China and migrates southwest to Yunnan, 

 the Shan States, and northern Siam (one record). 



This form resembles ocularis, but there is no black ocular streak. 



Little is known or recorded on the migration route of this form. 

 La Touche ^^ says that he never found it along the coast, so that its 

 migration must be inland and to the southwest. Its exact winter 

 quarters are apparently not well known. 



MOTACILLA LUGUBRIS ALBOIDES Hodgson 



Motacilla alboides Hodgson, Asiat. Res., vol. 19, p. 191, 1836 (Nepal). 



Dr. Smith did not secure this form in Siam but took a male not far 

 over the border at Chong Yam, Burma, January 15, 1933. 



De Schauensee '^ took a male at Chiengsen February 12, and 

 although his record of this species is the only one I have seen for Siam, 

 it probabl}'^ occurs oftener than the lone record would indicate, as it 

 breeds in the Himalayas, Tibet, the high mountains of western China, 

 and Tonldn, and migrates south to India, Burma, Siam, and Indo- 

 China. 



The adult of this form has the back and the throat black. 



MOTACILLA LUGUBRIS LEUCOPSIS Gould 



Motacilla leucopsis Gould, Proc. Zool. Soc. London, 1837, p. 78, 1838 (India). 



One male, Muang Pai, December 28, 1932; one male, Noan Wat, 

 February 14, 1929. Dr. Smith also took a male at Mehiek, 

 Burma, January 13, 1933. 



This form resembles alboides in the breeding plumage in being black 

 above, but the black below is confined to the jugulum; the throat is 

 white. Even in nonbreeding plumage the back is very dark gray, 

 the nape black. 



The form breeds in Manchuria, Mongolia, and northern China to 

 Tibet and winters in southern China, Indo-China, Assam, Burma, 

 eastern Bengal and Siam. In winter it has been taken practically all 

 over Siam proper but especially in the northern and eastern part. I 

 have no records for southwestern or Peninsular Siam, however. 



Deignan '^ reports it common on the plain at Cliiengmai from 

 September to April. 



8 Journ. Nat. Hist. Soc. Siam, vol. 2, p. 200, 1917. 



• Journ. Nat. Hist. Soc. Siam. vol. 5, p. 306, 1924. 



II A handbook of the birds of eastern China, vol. 1, pt. 5, p. 400, 1930. 



11 Proc. Acad. Nat. Sei. Philadelphia, vol. «6. p. 238, 1934. 



" Journ. Siam Soc. Nat. IJist. Suppl., vol. 8, p. 153, 1931. 



