THE BIRDS OF NORTHERN THAILAND 459 



The gray-headed flycatcher is a very common or even abundant 

 permanent resident in the evergreen of the Thanon Thong Chai and 

 Khun Tan ranges and on Phil Kha, at elevations in excess of 2,500 feet ; 

 during the cold weather, examples of this species, whether from the 

 neighboring hills or from a more northern breeding range, appear also 

 in small numbers in lowland bamboo. 



On Doi Suthep this active little bird may be seen, solitary or in 

 pairs, at every clearing and along all the trails and watercourses. 



I collected a male with enlarged gonads on Phu Kha, April 13. 

 Gyldenstolpe has recorded (1916) a juvenile male from Khun Tan, 

 May 14 ; one of Smith's specimens from the same locality, September 

 6, is in postjuvenal molt. 



An adult male had the irides brown ; the maxilla black ; the mandible 

 horn, browner on the apical half ; the feet and toes fleshy brown ; the 

 claws light horny brown. 



The adult of either sex has the entire head, neck, and breast gray, 

 more slaty on the crown and nape, more ashy on the throat and breast ; 

 the remaining upperparts bright golden-olive, becoming olive-golden 

 on the rump; the remiges and rectrices blackish brown, edged along 

 the outer web with olive-golden; the remaining underparts bright 

 yellow, strongly suffused with olivaceous on the upper abdomen and 

 along the flanks. 



It appears that this flycatcher breaks up into only two recognizable 

 forms, one of which is restricted to the island of Ceylon. For the 

 non-Ceylonese race, many names are available; the oldest are three 

 on the same page of a single paper by Oberholser, and I here employ 

 the first of the three. 



In 1923 Oberholser named Cidicicapa ceylonensis calochrysea from 

 "Quaymos, Choung, Thoungyin River, Tenasserim." This is a fitting 

 place to point out that the original label on the type specimen reads 

 "Quaymoo Choung, Thoungyin R r ." The "Quaymoo choung," fide 

 Bingham (Stray Feathers, vol. 9, 1880, p. 156) is "a small feeder of the 

 Thoungyeen, entering a little below the rapids of Kamaukla." The 

 type locality of calochrnfsea, then, is the Tenasserimese side of the Mae 

 Moei or Thaungyin river, at about latitude 17° 15' N. 



CHELIDORYNX HYPOXANTHA (Blyth) 



Yellow-browed Flycatcher 



Rhipidura hypoxantha Blyth, Journ. Asiat. Soc. Bengal, vol. 12, 1843, p. 935 

 (Darjiling). 



Chelidorhynx hypoxanthmn, Rogers and Deignan, Proc. Biol. Soc. Washington, 

 1934, p. 91 (Doi Ang Ka). — de Schauensee, Proc. Acad. Nat. Sci. Philadel- 

 phia, 1934, pp. 3, 220 (Doi Chiang Dao).— Riley, U. S. Nat. Mus. Bull. 172, 

 1938, p. 463 (Doi Ang Ka). 



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