BIRDS FROM SIAM AND THE MALAY PENINSULA 473 



quite, as well marked as the young of B.J. simillimus. The difficulty 

 is that there are too few young specimens taken on their breeding 

 grounds in collections to work out this plumage. 



Robinson and Kloss ^* state that this form is commoner than B. t. 

 plexus throughout the Malay Peninsula. This is very likely the case, 

 but there are few records. 



The form breeds in Kamchatka and northeastern Siberia and mi- 

 grates through eastern China to the Malay Peninsula, Java, the 

 Philippines, Celebes, and the Moluccas. 



BUDYTES FLAVUS TAIVANUS Swinhoe 



Budytes taivanus Swinhoe, Proc. Zool. Soc. London, 1863, p. 334 (Formosa). 



A male (in immature plumage) and a female collected by C. Boden 

 KJoss at Tanjong Kalong, Singapore, November 7, 1899, were received 

 from Dr. W. L. Abbott. 



Gyldenstolpe '* records two males collected at Koh Lak, December 

 2 ; Robinson and Kloss '^ state that they have seen three in the Wil- 

 liamson collection taken at Bangkok and that it is not a common bird 

 in the Malay Peninsula. 



The form breeds in the Lake Baical region to the Amur, Sakkalin, 

 and the Kurils, wintering in Formosa, southeastern China, Indo-China, 

 southern Siam, and the Malay Peninsula. 



It is easily recognized from the other forms of the species by the 

 yellow superciliary in all plumages. 



BUDYTES THUNBEKGI PLEXUS Thayer and Bangs 



Budytes flavus plexus Thayer and Bangs, Proc. New England Zool. Club, vol. 5, 



p. 41, 1910 (Kolyma River, northeastern Siberia). 

 "i Budytes flavus macronyx Stresemann, Avifauna Macedonica, p. 76, 1920 (Wladi- 



wostok). 



Seven males and two females, Bangkok, December 2, 22, 1924, 

 October 23, 1925, October 28, 192G, April 13-28, 1934; one male, 

 Nan, April 13, 1930. 



These specimens have been compared with five specimens of plexus 

 from the type locality with which they seem to agree fairly well, 

 except for one male taken April 13, which has a grayer head and 

 brighter back. All the Kolyma birds were taken in June and seem 

 to be somewhat faded. One male taken June 2 approaches this 

 bright-colored Bangkok male, however. 



While I have not had any specimens of macronyx from the type 

 locality for comparison, I am almost convinced that it is the same 

 as 'plexus and is the form that migrates through eastern China to the 



xjourn. Nat. Hist. Soc. Siam. vol. 5, p. 365, 1924. 



"Knngl. Svenska Vet.-Akad. nandl., vol. 56, no. 2, p. 32, 1916. 



"Journ. Nat. Hist. Soc. Siam, vol. 6, p. 366, 1924. 



