THE BIRDS OF NORTHERN THAILAND 475 



PHYLLOSCOPUS MACULIPENNIS MACULIPENNIS (Blyth) 



Eastern Ashy-throated Willow Warbler 



Abrornis tnaculipennis Blyth, Ibis, 1867, p. 27 (Nepal or Sikkim). 

 Phylloscopus tnaculipennis tnaculipennis, Greenway, Bull. Mus. Comp. Zool., 

 1940, p. 189 (Doi Aug Ka). 



The ashy-throated willow warbler has been found in Thailand only 

 by Griswold (Asiatic Primate Expedition), who collected two males 

 and two females at the summit of Doi Ang Ka, March 22 and 30, 1937. 

 It is probably only a winter visitor, restricted to our highest moun- 

 tains. 



This distinctively marked form has the forehead, crown, and nape 

 dark brownish gray, with a broken ashy-white median streak; the 

 remaining upperparts, except for the yellow rump, bright deep olive- 

 green ; the wings like the mantle but with the inner secondaries tipped 

 yellowish white on the outer web and the median coverts narrowly, 

 the greater coverts broadly, tipped yellow to form two conspicuous 

 bars; the three outermost pairs of rectrices with the inner web pure 

 white ; the lores and postocular streak dark brownish gray ; the long 

 supercilium ashy white ; the chin and throat ashy gray ; the remaining 

 underparts yellow. 



PHYLLOSCOPUS BOREALIS BOREALIS (Blasius) 



Siberian Arctic Willow Warbler 

 Phyllopneuste borealis Blasius, Naumannia, 1858, pp. 313-314 (Okhotsk Sea). 



A female collected by me at Ban Tha Fa (Phrae Province) , Septem- 

 ber 11, 1936, has been determined by Ticehurst to belong to the present 

 race, which is otherwise not recorded from northern Thailand. 



The bird was shot from a tall clump of bamboo in a district of low 

 hills covered with mixed-deciduous forest. 



This robust species has the entire upperparts grayish olive-green; 

 the wing like the mantle but with the outer greater coverts narrowly 

 tipped yellowish white to form a fairly conspicuous bar (the median 

 coverts often tipped slightly paler olive-green to form an obsolescent 

 bar) ; the lores and postocular streak dark olive-green ; the conspicuous 

 supercilium yellowish white ; the entire underparts white, sullied with 

 gray, and more or less strongly washed with pale yellow. 



PHYLLOSCOPUS BOREALIS EXAMINANDUS Stresemann 



Kamchatkan Arctic Willow Warbler 



Phylloscopus borealis examinandus Stresemann, Nov. Zool., vol. 20, 1913, pp. 



353-354 (Bali, Lesser Sunda Islands). 

 Acanthopneuste borealis xanthodryas, Deignan, Journ. Siam Soc. Nat. Hist. 



Suppl., 1936, p. 116 (Chiang Mai). 





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