THE BIRDS OF SOUTH-WEST AND PENINSULAR SIAM. 397 



States, and C. s. koratensis, of East and North Siam. Males have 

 the abdomen nearly as bright as the latter, but the rufous of the 

 foreneck extends downwards as far, and ends as indefinitely, as, in 

 the former. Females are practically indistinguishable from koraicm- 

 sis, but have the abdomen less greenish yellow than in singalensis. 

 The bills in this race and in sinrjalensis appear to be larger than in 

 koy^atensis. 



Burmese birds probably belong to the present form, while 

 koratensis occurs eastwards of the Chao Phya river. 



I. Gyldenstolpe, Kungl. Sv. Vet. Akad. Handl. M. Baker, Journ. N. H. Soc. Siam, iii, 1919. 



56, No. 2, 1916. (first and second parts). 



J. Bobinson, Journ. F. M. S. Mus.'vii, 1917. W. I. Baker, op, cit., iv, 1920 (third part). 



K. Kloss, Ibis, 1918. . M. 2. Baker, Fauna Brit. Ind., Birds, i, 1922. 



L. Kobinson and Kloss, Journ, N. H. Soc. Siam, 



iii. 1919. 



VOL. V, NO. 3, 1924. 



