THE BIRDS OF NORTHERN THAILAND 451 



The range of this flycatcher extends into the southern portions of our 

 area along the drainage systems of the Mae Ping (Ban Sop Mae 

 Chaem, Chom Thong, Chiang Mai), the Mae Wang (Ban Mae Mo), 

 the Mae Yom (Ban Huai Horn, Den Chai), and the Mae Nan (Doi 

 San Huai Wai, Doi San Pa Bong, Phu Het). 



The white-bellied cyornis is a fairly common permanent resident 

 of the lowlands (not yet recorded at elevations above 1,000 feet), 

 likely to be found wherever a heavy stand of tall bamboo overarches 

 some quiet stream or pool. It may occur in temple precincts and 

 village gardens as well as in wild bamboo brakes far from human 

 habitation. It has a soft, whistled song of five or six notes, the first 

 and fifth or the second and sixth notes higher than the others. 



A male from Chiang Mai, May 19, had the gonads greatly enlarged. 

 Examples in post ju venal molt have been taken June 4 (Doi San Huai 

 Wai) , June 11 (Phu Het) , August 21 and 25 (Ban Mae Mo) ; a bird in 

 postnuptial molt, October 10 (Chiang Mai). 



Adults had the irides brown; the bill black; the feet, toes, and claws 

 violet-gray ; the soles whitish. 



The old male differs from that of C. b. lohitei only in having the 

 bright orange-rufous of the throat and breast sharply divided (in a 

 straight line) from the white of the remaining underparts (the under 

 wing coverts and the flanks but slightly, if at all, washed with orange- 

 rufous). The adult female differs from those of all the closely related 

 forms of our provinces in having the upperparts olivaceous-brown, 

 more or less strongly overlaid with bluish ashy, and changing to gray- 

 ish blue on the upper tail coverts and tail ; the orange of the throat and 

 breast sharply divided from the white of the remaining underparts, 

 as in the male. 



CYORNIS UNICOLOR UNICOLOR Blyth 



Himalayan Pale-blue Cyornis 



C[yornis] unicolor Blyth, Journ. Asiat. Soc. Bengal, vol. 12, 1843, pp. 1007-1008 

 (Darjiling). 



Cyornis unicolor liarterti, de Schauensee, Proc. Acad. Nat. Sci. Philadelphia, 

 1928, p. 571 (Doi Suthep). 



Cyornis unicolor unicolor, Chasen and Boden Kloss, Journ. Siam Soc. Nat. Hist. 

 Suppl., 1932, p. 239 (Doi Suthep). — Riley, U. S. Nat. Mus. Bull. 172, 1938, 

 p. 453 (Khun Tan, Doi Langka, Doi Hua Mot, "Doi Kiew Koh Ma"). 



Muscicapula unicolor unicolor, de Schauensee, Proc. Acad. Nat. Sci. Philadel- 

 phia, 1934, p. 214 (Doi Suthep, Doi Chiang Dao). — Deignan, Journ. Siam 

 Soc. Nat. Hist. Suppl., 1936, p. 119 (Doi Suthep). 



The pale-blue flycatcher is an uncommon permanent resident on the 

 higher hills of the Thanon Thong Chai and Khun Tan ranges ; it has 

 been recorded at elevations between 3,000 feet (Doi Khun Tan) and 

 5,500 feet (Doi Suthep). 



