THE BIRDS OF NORTHERN THAILAND 395 



A male and two females were taken by Williamson's collector, dur- 

 ing April 1916, "in the Muang Song forest"; the bird has not since 

 that time been found in Thailand. 



These specimens were presumably collected in the neighborhood of 

 limestone crags, which are numerous in that portion of Phrae Prov- 

 ince. They are, however, likewise numerous at many other northern 

 localities, and it is noteworthy that the bird has never been redis- 

 covered, although I looked for it constantly over a period of years. 



Williamson believed that his examples represented "young birds 

 of the year," but all are, in my opinion, normally colored adults of 

 a population in which partial albinism is exceptional — rather than 

 the rule, as in Tenasserim. 



In default of specimens at hand, I quote here the description of 

 "birds of the first year," as given by Stuart Baker (Fauna of British 

 India, Birds, ed. 2, vol. 1, 1922, p. 249) : "The forehead to back olive- 

 brown, each feather margined with black ; the rump, upper tail-coverts, 

 tail and exposed portions of wing olive-brown ; the sides of the forehead 

 and a short supercilium . . . greyish white with black specks; chin, 

 throat and upper breast white, streaked with dark brown, especially 

 on the breast; remainder of lower plumage ochraceous olive-brown." 



I have examined Sir Walter's skins in London and agree with him 

 that they show no approach to annamensis and must be placed with 

 the nominate form. 



napothera brevicaudata brevicaudata (biyth) 

 Tenasserimese Streaked-throated Wren Babbler 



Tlurdinus] brevicaudatus Blyth, Journ. Asiat. Soc. Bengal, vol. 24, 1855, p. 



272 (mountainous interior of Tenasserim; type from Muleyit, fide Sclater, 



Ibis, 1892, p. 76). 

 Corythocichla brevicaudata, Gtldenstolpe, Kungl. Svenska Vet.-Akad. Handl., 



1916, p. 58 (Doi Pha Sakaeng). 

 Corythocichla brevicaudata brevicaudata, Gtldenstolpe, Ibis, 1920, p. 485 (Doi 



Pha Sakaeng). 

 Napothera brevicaudata (probably N. b. vcnningi), Rogers and Deignan, Proc. 



Biol. Soc. Washington, 1934, p. 91 (Doi Ang Ka). 

 Napothera brevicaudata brevicaudata, Deignan, Journ. Siam. Soc. Nat. Hist. 



Suppl., 1931, p. 137 (Doi Suthep) ; 1936, p. 106 (Doi Suthep).— de Schauen- 



see, Proc. Acad. Nat. Sci. Philadelphia, 1934, p. 190 (Doi Chiang Dao). 

 Corythocichla brevicaudata venningi, Riley, tj. S. Nat. Mus. Bull. 172, 1938, p. 



334 (Doi Langka). 



The present form probably occurs wherever, on our mountain slopes, 

 moist evergreen forest arises from a confusion of tumbled boulders 

 and broken rock, whether limestone or granite ; owing to its timidity 

 and the nature of its haunts, however, its true status at any given 

 locality is uncertain. On Doi Ang Ka it has been found fairly com- 



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