BIRDS FROM SIAM AND THE MALAY PENINSULA 367 



April 12, 1929; one female, Lat Biia Kao, July 31, 1929; one male and 

 one female, Pak Chong, December 22, 1926, and November 29, 1929; 

 one male, Tlia Chang, March 17, 1927; one male, Bua Yai, Korat 

 Plateau, February 15, 1929; one female, Muek Lek, April 26, 1933; 

 one male, Chantuk, June 12, 1934; one male, Sriracha, April 19, 

 1934; one female, Kao Seming, Krat, October 12, 1928. 



Dr. W. L, Abbott took the following in the Malay Peninsula: Five 

 males and three females, Trang (Prahmon, February 21-March 24, 

 1896; Tyching, April 24, 1896; Kantany, January 16, 1897; Trang, 

 January 21, 1899); one male and two females, Trengganu (Dungun 

 River, September 19, 1900; Tanjong Dungun, September 20 and 21, 

 1900); one male, mouth of Rumpin River, Pahang, May 20, 1902. 

 He gives the color of the soft parts as: Iris white or grayish white; 

 bill leaden blue, culmen black; feet plumbeous or leaden blue. 



In this large series there are very few males with much black on the 

 upperparts, and when present it is confined mostly to the pileum and 

 nape. There seems to be little or no difference between Peninsular 

 Siam specimens and those from farther north. The male collected by 

 Dr. Abbott in Pahang should represent A. t. singapurensis Chasen 

 and Kloss,'* but in the series from Bangkok there is a male that has 

 even more black. Dr. Oberholser described this dark bird from Banka 

 as A. t. micromelaena,^^ and, if worthy of recognition, the latter name 

 will have to be used. 



The male from Pahang measures: Wing, 64; tail, 46.5; culmen, 

 15 mm. Four males from Banka: Wing, 59-63 (61.5); tail, 44-45.5 

 (44.9); culmen, 15-17 (15.6) mm. Seven males from the Malay 

 Peninsula, north of the Federated States: Wing, 61-65 (62.4); tail, 

 43-47 (44.8) ; culmen, 15-16 (15.3) mm. Ten males from Siam proper: 

 Wing, 60-67 (63.8); tail, 43-53 (47.5); culmen, 14.5-16 (14.8) mm. 



De Schauensee ^^ states that specimens from northern Siam have 

 paler throats and backs than birds from Bangkok southward. My 

 series of males from northern Siam is a small one and does not show 

 the deeper yellow throat of the southern bird; possibly the backs of 

 the northern specimens average somewhat paler, but birds can be 

 picked out of my series from the Malay Peninsula that are just as 

 pale. I believe the deeper yellow throats are due to age, as there are 

 a number in my series that are molting from a lighter to a deeper 

 yellow throat, and this also applies to the color of the back. At first 

 the young male resembles the female, the darker back of the fully 

 adult male being acquired only after several molts. 



The present form extends eastward from Bengal to Burma, Assam, 

 Siam, and Indo-Cliina, except the north; southward it extends down 



'« Bull. Raffles Mus.. no. 5, p. 85, 1931. 



" Smithsonian Misc. Coll., vol. 76, no. 6, p. 7, 1923. 



i» Proc. Acad. Nat. Sci. Philadelphia, vol. 86, p. 199, 1934. 



