THE BIRDS OF NORTHERN THAILAND 423 



harica but have not shown how it may be distinguished from pellogyna. 

 I strongly suspect, however, that these putative races will prove to be 

 one and the same thing as interposita, which will then have a range 

 exactly coinciding with that of Copsychus s. erimelas. 



MONTICOLA GULARIS (Swinhoe) 



White-throated Rock Thrush 



Oroecetes gularis Swinhoe, Proc. Zool. Soc. London, 1862, p. 318 (Tientsin, 



China). 

 Monticola gularis, Gtldenstolpe, Kungl. Svenska Vet.-Akad. Handl., 1916, p. 48 



(Khun Tan) ; Ibis, 1920, p. 478 (Khun Tan). 

 Monticola gularis gularis, de Schauensee, Proc. Acad. Nat. Sci. Philadelphia, 



1934, p. 212 (Doi Suthep). — Deignan, Journ. Siam. Soc. Nat. Hist. Suppl., 



1936, p. 113 (Doi Suthep). 



This little rock thrush is hardly more than a straggler to northern 

 Thailand, whence it has been recorded only twice : An undated male 

 shot by Eisenhofer's collector at Khun Tan (specimen in Stockholm) ; 

 a male taken by de Schauensee on Doi Suthep, 1,500 feet, December 

 18, 1932. 



The male, in winter dress, has the forehead, crown, nape, and center 

 of the upper back violet-blue, each feather with a narrow black sub- 

 terminal bar and narrow grayish-buff tip; the mantle black, each 

 feather with a conspicuous grayish-buff margin, changing on the rump 

 and upper tail coverts to chestnut-rufous, each feather with a buffy 

 margin; the tail slaty; the wings blackish with a large violet-blue 

 shoulder patch, the outer secondaries with a conspicuous white area 

 near the base of the outer web, the inner secondaries and the greater 

 coverts tipped and margined along the outer web with white or buffy 

 white ; the ear coverts black, tipped with grayish buff ; the throat with 

 a white central streak which flares broadly on the uppermost part of 

 the breast; the remaining underparts chestnut-rufous, paling on the 

 center of the abdomen and the under tail coverts, the feathers of the 

 sides of the throat, breast, and flanks narrowly margined with grayish 

 buff. The female in winter has the upperparts grayish brown, the 

 feathers of the mantle with crescentic black subterminal bars and 

 grayish-buff tips, the upper tail coverts barred grayish buff and black 

 throughout ; the throat patch exactly as in the male ; the feathers be- 

 neath and behind the ear coverts with broad buffy-white tips and cen- 

 tral streaks, to form a light area at either side of the neck ; the remain- 

 ing underparts buffy white, the feathers conspicuously marked with 

 crescentic black bars except on the center of the abdomen, the under 

 tail coverts, the under wing coverts, and the axillaries. 



