THE BIRDS OF NORTHERN THAILAND 477 



15, 1936, has been identified by Dr. Ticehurst as an example of P. i. 

 obscuratus. 



"Like trochiloides, but somewhat paler, brighter and greener on the 

 upper parts and edges of wings and tail, but a little darker than 

 plumbeitarsus. The upper wing bar is usually indicated, in some 

 markedly so, and the lower one is broader than in plumbeitarsus, both 

 bars yellowish in fresh dress as in trochiloides. Under parts a little 

 more yellow than in plumb eitarsus. . . ." (Ticehurst, Systematic 

 review of the genus Phylloscopus, 1938, p. 147) . 



PHYLLOSCOPUS TROCHILOIDES PLUMBEITARSUS Swinhoe 



Siberian Dull-green Willow Warbler 



Phylloscopus plumbeitarsus Swinhoe, Ibis, 1861, pp. 330-331 ("between Takoo 

 and Peking, in the neighbourhood of the Peiho River, Province of Cheiee, 

 North China"). 



Phylloscopus nitidus phimbeitarsus, Gyldenstolpe, Kungl. Svenska Vet.-Akad. 

 Handl., 1913, p. 29 ("Northern Siam") ; Ibis, 1920, p. 474 (Den Chai).— 

 de Schauensee, Proc. Acad. Nat. Sci. Philadelphia, 1934, p. 230 (Chiang Mai, 

 "Tung Sio").— Riley, U. S. Nat. Mus. Bull. 172, 1938, p. 434 (Mae Hong Son, 

 Muang Pai, Chiang Mai, Phrae, Ban Nana Khian). 



Acanthopneuste nitidus plumbeitarsus, Deignan, Journ. Siam Soc. Nat. Hist. 

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



The Siberian dull-green willow warbler is a common winter visitor 

 to the lowlands of all the northern provinces, where it has been recorded 

 from November 8 (1935) at Chom Thong to April 26 (1930) at Phrae. 



This bird seems to be strictly confined to the plains and, in my 

 experience, is only found in the great clumps of garden bamboo, which 

 are so important a feature of our landscapes. 



Prenuptial molt is shown by specimens taken between March 30 and 

 April 26. 



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

 the mandible horny yellow; the tarsi plumbeous-brown; the toes and 

 claws horny brown. 



Distinguished "from trochiloides by the greener, less olive brown 

 upper parts and whiter under parts; supercilium less yellow and 

 sharper defined ; streak behind eye paler, neck less ashy ; wing bars 

 narrower; and by wing formula and smaller size and shorter first 

 primary. In skins the upper mandible in winter is brown and in 

 trochiloides nearly black. . . ." (Ticehurst, Systematic review of the 

 genus Phylloscopus, 1938, p. 151). 



PHYLLOSCOPUS TENELLIPES Swinhoe 



Pale-legged Willow Warbler 



Phylloscopus tenellipes Swinhoe, Ibis, 1860, p. 53 (Amoy, China). 

 Phylloscopus tennellipes [sic], Gyldenstolpe, Kungl. Svenska Vet.-Akad. Handl., 

 1916, p. 46 (Den Chai). 



