476 BULLETIN 186, UNITED STATES NATIONAL MUSEUM 



A unique female from Chiang Mai, 1,000 feet, October 27, 1935, has 

 been studied by Dr. Ticehurst, whose comment is : "examinandus, if 

 sex is right." The specimen, evidently not mutilated by shot, was 

 skinned by me and, since nothing in my field-catalogue indicates that 

 I was then doubtful of the sex, I leave it under this name. 



"In spring dress like borealis but a little greener, less grey green on 

 upper parts and a little yellower on the under parts. Averages larger 

 in size. Less green and less yellow than is usual in xanthodryas" 

 (Ticehurst, Systematic review of the genus Phylloscopus, 1938, p. 128) . 



PHYLLOSCOPUS TROCHILOIDES TROCHILOIDES (Sundevall) 



Eastern Himalayan Dull-green Willow Warbler 



Acanthiza trochiloides Sundevall, Physiogr. Siillsk. Tidskr. [Lund], vol. 1, 1837, 



p. 76 (Calcutta, Bengal). 

 Phylloscopus trochiloides trochiloides, Gkeenway, Bull. Mus. Comp. Zool., 



1940, p. 190 (Doi Nang Kaeo). 



A male and a female of the nominate race of the dull-green willow 

 warbler were collected by Griswold (Asiatic Primate Expedition) on 

 Doi Nang Kaeo, 2,800 feet, April 8 and 18, 1937. 



Both specimens are in prenuptial molt. 



Another large species, this bird has the entire upperparts dark 

 olive-green; the wing like the mantle but with the greater coverts 

 tipped pale yellow or yellowish white to form a conspicuous bar (the 

 median coverts often similarly tipped to form a more or less distinct 

 bar) ; the lores and postocular streak blackish olive-green ; the con- 

 spicuous supercilium yellowish white ; the entire underparts yellowish 

 white sullied with gray. In life, the races of P. trochiloides cannot 

 be distinguished from those of P. borealis; in the hand, they may be 

 most easily recognized by their having the sixth primary emarginate 

 on the outer web. 



Greenway observes (loc. tit.) that these examples "are assigned 

 with some doubt to this species [= subspecies], though they are 

 closest to it." I have been privileged to examine the birds in question 

 and, having compared them with series of trochiloides, obscuratus, and 

 plumbeitarsus (all determined by Ticehurst), wholly concur with 

 Greenway's identification. The form is already known to winter in 

 all the areas adjacent to northern Thailand. 



PHYLLOSCOPUS TROCHILOIDES OBSCURATUS Stresemann 



Kansu Dull-green Willow Warbler 



Phylloscopus trochiloides ooscuratus Stkesemann, Orn. Monatsb., vol. 37, 1929, 

 pp. 74-75 (South Tetung Mountains, North Kansu). 



A female in fine plumage, shot by me at Chiang Mai, 1,000 feet, May 



