470 BULLETIN 186, UNITED STATES NATIONAL MUSEUM 

 PHYLLOSCOPUS SUBAFFINIS Ogilvie Grant 



Buff-bellied Willow Warbler 



Phyllo8COpu8 subafflnis Ogilvie Grant, Bull. Brit. Orn. Club, vol. 10, 1900, pp. 



37-38 (Pu-an-ting, southwestern Kweichow, China). 

 Phaearadina subasffinis, Rlley, U. S. Nat. Mus. Bull. 172, 1938, p. 432 (Doi Langka). 



The buff-bellied willow warbler, known from Thailand by a single 

 female collected by Smith at Doi Langka, November 13, 1930, is evi- 

 dently very rare in our provinces. 



The specimen is in rather worn plumage but is undergoing molt of 

 the feathers of throat and upper back. 



This plain-colored but distinctive species has the entire upperparts 

 olive-green, strongly suffused with buff ; the lores and postocular streak 

 olivaceous-brown; the supercilium and underparts yellow, strongly 

 suffused with buff, especially along the flanks and on the under tail 

 coverts. 



PHYLLOSCOPUS FUSCATUS FUSCATUS (Blyth) 



Siberian Dusky Willow Warbler 



Phyllopneuste fuscata Bt.yth, Journ. Asiat. Soc. Bengal, vol. 11, 1842, p. 113 



("Shot in the neighbourhood" [^Calcutta, Bengal]). 

 Phylloscopus fuscata fuscata, Gyldenstolpe, Kungl. Svenska Vet.-Akad. Handl., 



1916, p. 45 (Khun Tan, Sop Tui) ; Ibis, 1920, p. 474 (Khun Tan, Sop Tui). 

 PhyUoscopus fuscatus fuscatus, Deignan, Journ. Siam Soc. Nat. Hist. Suppl., 



1931, p. 149 (Chiang Mai) ; 1936, p. 116 (Chiang Mai). 

 Phaeoradina fuscata fuscata, Riley, U. S. Nat. Mus. Bull. 172, 1938, p. 432 (Ban 



Nam Khian). 



The dusky willow warbler is a very common winter visitor to the 

 lowlands of every part of our area, where it has been recorded from 

 September 30 (Chiang Mai) to May 6 (Chiang Kai). 



Of all the many willow warblers that visit Thailand during the cold 

 weather, only P. i. inomatus occurs in greater numbers than this one. 

 Strictly confined to the plains, fuscatus is never found high in the 

 trees but haunts hedges and bushes, in gardens or wastelands, and 

 especially the great clumps of bamboo overhanging ponds and 

 streams. 



Specimens taken between April 22 and May 6 are in prenuptial molt. 



A male had the irides dark brown; the maxilla horny brown; the 

 mandible yellowish, dusky flesh at the tip; the feet and toes fleshy 

 horn ; the soles yellow ; the claws horn. 



Another plain-colored form, this bird has the entire upperparts 

 dark olivaceous-brown; the lores and a streak behind the eye blackish 

 brown ; the supercilium and underparts pale rusty buff, albescent on 

 the chin, throat, and center of the abdomen, usually more grayish on 

 the breast (the center of the abdomen sometimes lightly washed with 

 cream). 



