444 BULLETIN 17 2, UNITED STATES NATIONAL MUSEUM 



wings darker than the back, the remiges sHghtly edged with cinna- 

 mon; middle tail feathers the color of the back, outer feathers lighter 

 and with a small brownish-olive subterminal spot, all the feathers 

 narrowly tipped with light buff; thighs and bend of wing cinnamon- 

 buff or deep colonial buff. 



Winter plumage: Snuff brown above; clay color beneath; center of 

 belly with a slight deep colonial-buff tinge, sometimes absent; tail 

 darker than the back, much longer than in summer plumage, but 

 with the same pattern. 



The Nan male measures: Wing, 45; culmen, 11 mm. Two breed- 

 ing males from Szechwan: Wing, 46-47; culmen, 11-11.5 mm. 



Breeding specimens of P. exter might be taken for immature flavi- 

 ventris, but the immature of the latter is entirely yellow below and 

 otherwise different. The bill in flaviventris is longer and m the 

 breeding season black; exter in the breeding season has the base of 

 the bill light colored, only the tip black in the skin. 



The above record extends the range from western Szechwan and 

 western Yunnan to northern Siam. 



Family MUSCICAPIDAE: Old World Flycatchers 



HEMICHELIDON SIBIRICA SIBIRICA (Gmelin) 



Muscicapa sibirica Gmelin, Systema naturae, vol. 1, pt. 2, p. 936, 1789 (near 

 Lake Baical, eastern Siberia, and Kamtschatka). 



One female, Kao Sabap, November 16, 1933; one female, Doi Hua 

 Mot, August 20, 1934. 



The female from Kao Sabap is very dark on the back but is not so 

 dark below as rothschildi; wing, 80 mm. I have examined a fall 

 specimen from Korea of sibirica that is just as dark. 



De Schauensee^° records a male from Nakon Nayok, October 30; 

 on his third expedition^* he took a female at Petrieu, October 22. 

 Kobinson and Kloss ^^ state that some form of this species is common 

 in the Straits of Malacca or the mountains of the Malay States 

 between November and April and that the majority seem to belong 

 to this form. 



The form breeds in northeast Siberia and migrates through China 

 to Indo-China, Siam, and the Malay States. 



HEMICHELIDON SIBIRICA ROTHSCHILDI Baker 



Hemichelidon sibirica rothschildi Baker, Bull. Brit. Orn. Club, vol. 43, p. 156, 

 1923 (Lickiang Range, Yunnan). 



Dr. W. L. Abbott collected a single male six miles south of Boyces 

 Point, Tenasserim, February 17, 1904. 



«i> Proc. Acad. Nat. Sci. Philadelphia, vol. 81, p. 544, 1930. 

 »i Proc. Acad. Nat. Sci. Philadelphia, vol. 86, p. 213, 1934. 

 «« Journ. Nat. Hist. Soc. Siam, vol. 5, p. 228, 1924. 



