28 MR. E. C. STUART BAKER ON 



S Pak Jong, E. Siam, 17.8.15. 



4 6 1 9 Maprit, P. Siam, 31.10.15 to 7.1.16. 



The wings of these birds are all under 147 mm. (5.8 in.), 

 and do not approach in size the larger Chinese form whiteleyi. The 

 colour of the upper parts of the specimens in this series varies 

 greatly, as it does over the whole of its range. Nos. 1 and 2 are 

 extremely rufous, whilst of the Maprit birds one is nearly pure grey 

 (specimen No. 4J1.15), and others again vary between the two 

 extremes. 



ACOIPITRES. 



226. Spizaetus alboniger. 



Nigaitus alboniger, Blyth, J. A. S. B., xiv, p. 178 (1845). 



6 Tung Song, P. Siam, 23.9.15. < 



A magnificent specimen of this most beautiful Eagle, whose 

 colour alone assuredly warrants its being placed in a separate genus 

 to the brown eagles of India and Burma to which the name 

 Spizaehis properly applies. 



^227. Spilornis cheela rutherfordi. 



Spilornis rutherfordi, Swinhoe, Ibis, p. 85 (1870), 

 9 Tong Song, P. Siam, 26.9.15. 



This is a very small specimen, and possibly has been wrongly 

 sexed by the native collector, reliable as he seems to have been in 

 practically every other case. The wing measures only 378 mm. 

 228. BUTASTUR INDICUS. 



Falco indicus, GmeL, Sy:»t. Nat, i, p. 264 (1788), 



9 Krabin, C. Siam, 1.11.15. 



It is not yet known whether this fine bird breeds in any of 

 the Central Chinese mountains, but in Siam it is only a winter 

 visitor. 



-f-229. HaLIASTUR INDUS INDUS. 



Falco Indus, Bodcl., Tab. PI. Enl., p. 25 (1783). 



6 Bangkok, 30. 6. 15. 



d juv. c? Sansep, Bangkok, 4. 7. 15. 



The <S juv. is in quite young plumage, showing no -chestnut 

 below, but with the tail and upper tail-coverts more or less suffused 

 with this colour. 



JOURN. NAT. HIST. SOC. SIAM. 



