THE BIRDS OF NORTHERN THAILAND 287 



A specimen from Khun Tan, August 25, is in postjuvenal molt ; seven 

 adults from various localities, taken between August 3 and September 

 4, are in postnuptial molt. 



A male had the irides brown ; the eyelids plumbeous ; the bill black ; 

 the interior of the mouth flesh ; the feet, toes, and claws black. 



The old male is generally ashy gray but has the lores and eye ring 

 black ; the ear coverts slaty ; the primaries black, narrowly margined 

 along the outer web with pale gray; the rectrices (except the central 

 pair) black, narrowly margined and broadly tipped with pale gray ; 

 the under tail coverts and under wing coverts white. The old female 

 is similar but has the lores and eye ring slaty, like the ear coverts. 

 Younger birds of either sex have the lores as in the old female; the 

 remiges and rectrices more conspicuously edged with pale gray or 

 white: the underparts marked with narrow, wavy bars of gray and 

 white. 



Family DICRURIDAE 



DICRURUS LEUCOPHAEUS MOUHOTI (Walden) 



Indo-Chinese Pale Ashy Drongo 



Buchanga mouhoti Walden, Aim. Mag. Nat. Hist., ser. 4, vol. 5, 1870, p. 220 

 (Cambodia ; type locality restricted to Angkor, by Riley, Proc. Biol. Soc. 

 Washington, vol. 53, 1940, p. 132). 



Dicrurus cineraccus, Gyxdknstolpe, Kungl. Svenska Vet.-Akad. Handl., 1913, 

 p. 27 (Ban Huai Horn, Phrae) ; Journ. Nat. Hist. Soc. Siam, 1915, p. 167 

 (listed). 



Buchanga cineracea mouhoti, Gyxdenstolpe, Kungl. Svenska Vet.Akad. Handl., 

 1916, p. 21 (Khun Tan, Doi Pha Sakaeng). 



Buchanga cineracea nigrescens, Gyldenstolpe, Ibis, 1920, p. 451 ("Northeim 

 Siam"). 



Buchanga cineracea cineracea, de Schauensee, Proc. Acad. Nat. Sci. Philadel- 

 phia, 1928, p. 557 (Doi Suthep). 



Dicrurus leucophaeus hopwoodi, de Schauensee, Proc. Acad. Nat. Sci. Philadel- 

 phia, 1929, p. 552 (Doi Suthep, Chiang Mai, Chiang Saen, Chiang Rai) ; 

 1934, p. 226 (Doi Suthep, Doi Chiang Dao).— Deign an, Journ. Siam Soc. Nat. 

 Hist. Suppl., 1931, p. 147 (Doi Suthep, Chiang Mai). 



Dicrurus leucophaeus hopwoodi [partim], Chasen and Boden Kloss, Journ. Siam 

 Soc. Nat. Hist. Suppl., 1932, p. 247 (Doi Suthep [partim]). 



Dicrurus leucophaeus mouhoti, Deignan, Journ. Siam Soc. Nat. Hist. Suppl., 1936, 

 p. 101 (Doi Suthep). 



Dicrurus leucophaeus mouhoti [partim], Riley, U. S. Nat. Mus. Bull. 172, 1938, 

 p. 281 (Huai Mae Lao, Song Khwae valley, Doi Langka). 



The resident form of the pale ashy drongo is common in the more 

 open evergreen, in overgrown clearings, and even in bamboo brakes, 

 throughout the northern provinces, chiefly from 4,500 to 2,000 feet but 

 ranging onto the plains, at least during the cold weather, wherever 

 suitable vegetation can be found. 



