358 BULLETIN 17 2, UNITED STATES NATIONAL MUSEUM 



The form ranges from the mountains of Tenasserim north to eastern 

 Burma and northern Siam. 



SIVA STRIGULA CASTANICAUDA Hume 



Siva castanicauda Hume, Stray Feathers, vol. 5, p. 100, 1877 (Moolyit, Tenas- 

 serim) . 



Four males and two females, Doi Angka, 8,000-8,400 feet, December 

 5,6,1928. 



This form is said to range all over Burma from Tenasserim to the 

 Chin and Kachin Hills, and southward it extends to northern Siam. 



Specimens of S. s. yunnanensis in fresh unfaded plumage are not 

 strikingly different. The pileum is brighter, the mantle browner, and 

 the rufous on the middle tail feathers somewhat deeper 



Deignan *^ paid a visit to Doi Angka and took a male at 8,400 feet, 

 April 8, 1931. 



A form also is found in the Malay States — S. s. malayana Hartert. 



SIVA CYANOUROPTERA OATESI Harington 



Siva cyanouroptera oatesi Harington, Bull. Brit. Orn. Club, vol. 33, p. 62, 1913 

 (Byingyi Mountain, Shan Plateau, Burma). 



Six males and one female, Doi Nangka, November 10-17, 1930; 

 April 25, 1931 ; one immature male, Doi Hua Mot, August 30, 1934. 



The adults have been compared with a single specimen of S. c. 

 cyanouroptera. They are a lighter brown on the mantle; the white 

 tips to the inner remiges are reduced almost to the vanishing point; 

 the pileum is darker. 



The immature male from Doi Hua Mot is quite different from the 

 adult. The pileum is drab without any blue, except for a faint line 

 above the white superciliary; back a little lighter than the pileum; 

 rump cinnamon-buff; wings similar to the adults but with more white 

 edging on the inner feathers; the closed tail is quaker drab with a blue 

 tinge near the base; lower parts white, with a slight grayish tinge 

 anteriorly, but much lighter than the adult. It is about adult size 

 and unique in plumage. 



So far as known, this form is confined to the Shan Plateau, Burma, 

 and northern Siam. 



De Schauensee,*^ Deignan," and Chasen and Kloss *^ have recorded 

 it from Doi Sutep, 4,600-5,500 feet; de Schauensee ^^ on his third expe- 

 dition took it also at Chiengdao at 4,500 feet. 



" Proc. Biol. Soc. Wa-ohington, vol. 47, p. 91, 1934. 

 M Proc. Acad. Nat. Sci. Philadelphia, vol. 81, p. 535, 1930. 

 « Journ. Siam Soc. Nat. Hist. Suppl., vol. 8, p. 138, 1931. 

 •« Journ. Siam Soc. Nat. Hist. Suppl., vol. 8, p. 245. 1932. 

 « Proc. Acad. Nat. Sci. Philadelphia, vol. 86. p. 196, 1934. 



