THE BIRDS OF NORTHERN THAILAND 369 



Siva cyanouroptera oatesi, Deignan, Jouru. Siam Soc. Nat. Hist. Suppl., 1931, p. 138 

 (Doi Suthep) ; 1936, p. 107 (Doi Suthep). — Chasen and Boden Kloss, Journ. 

 Siam Soc. Nat. Hist. Suppl., 1932, p. 245 (Doi Suthep). 



Examples which are best placed under this name have been collected 

 on Doi Ang Ka (4,900 feet) , Doi Suthep (4,600 to 5,500 feet) , and Doi 

 Chiang Dao (4,500 to 6,900 feet) . 



It is an apparently rare bird in Thailand, haunting the more open 

 evergreen and the hill-forest of oak and chestnut, singly or in pairs, but 

 often in company with other small arboreal babblers. It is a very silent 

 form and probably frequently escapes notice through its quiet ways. 



A specimen just beginning postjuvenal molt was taken on Doi 

 Suthep, July 13, 1935. 



A male from Doi Ang Ka had the irides creamy white ; the maxilla 

 horny black, with the narial region horny brown and the edges of the 

 commissure horny gray ; the mandible with the apical half horny gray, 

 the rest horny white ; the feet, toes, and claws horny gray-brown. 



The adult (in our provinces) has the forehead, crown, and nape dull 

 brown, more or less strongly washed with violet-blue (especially at 

 the sides), the front sometimes with faint indications of dark shaft 

 streaks; the mantle dull olivaceous-brown, suffused with fulvous on 

 the rump and upper tail coverts (this color sometimes invading the 

 back) ; the primaries black, with the outer web deep blue; the second- 

 aries black, the outermost with the outer web narrowly edged violet- 

 ashy, the following with the outer web narrowly edged violet-blue, the 

 innermost with the entire outer web brownish ashy ; the central pair 

 of the graduated, truncated rectrices wholly deep blue, the following 

 pairs with the inner web blackish and the outer web deep blue, the 

 three outermost pairs with an increasing amount of white on the inner 

 web until the shortest has the inner web wholly white (and the outer 

 web black) ; a narrow violet-white supercilium; the ear coverts and 

 sides of the neck violet-ashy ; the entire underparts white (in the spring 

 months, often sullied from contact with burned trees). The juvenile 

 differs from the adult chiefly in having the forehead, crown, and nape 

 uniform dull brown. 



SIVA CYANOUROPTERA OATESI Haiinzton 



Shan Blue-winged Siva 



Siva cyanuroptera oatesi Haeington, Bull. Brit. Orn. Club, vol. 33, 1913, p. 62 



(Mount Byingyi, Loilong State, Southern Shan States). 

 Siva cyanouroptera oatesi, Riley, U. S. Nat. Mus. Bull. 172, 193S, p. 358 (Doi 



Hua Mot, Doi Langka). 



A form of the blue-winged siva, which may most conveniently be 

 called oatesi, has been taken on Doi Hua Mot, Doi Langka, and Doi 

 Pha Horn Pok (6,400 feet). It seems to be rather common on these 



