BIRDS FROM SIAM AND THE MALAY PENINSULA 281 



It measures: Wing, 146; tail, 152; middle tail feathers, 102; culmen, 

 23 mm. Six males from northwestern Yunnan measure: Wing, 

 143.5-157 (149.6); tail, 145-165 (155.6); middle tail feathers, 95- 

 113.5 (105.7); culmen, 22-23 (22.7) mm. Seven females from north- 

 western Yunnan and one from southwestern Szechwan: Wing, 145- 

 153 (147.3); tail, 141-164.5 (153.2); middle tail feathers, 98-110 

 (102.4); culmen, 21.5-24 (23) mm. 



The form has been taken on Doi Sutep by several collectors. 

 Robinson and KHoss " record it from Namchuk, Pakchan, and Koh 

 Lak, but the measurement of the wing of one of the specimens looks 

 conspicuously small. 



This is the largest and darkest of the gray drongos occurring in 

 Siam. It breeds in the mountains of southwestern Szechwan, north- 

 western Yunnan, northern Burma, Assam, and Bengal, and migrates 

 to Tonkin, northern Laos, Annam, and Siam to winter. 



DICRURUS LEUCOPHAEUS MOUHOTI (Walden) 



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

 (Cambodia) . 



One male, Huey Lao, December 24, 1932; one male, Song Kwe 

 Valley, January 20, 1933; two females, Kliun Tan Mountains, 4,000- 

 4,400 feet, November 21, 22, 1928; one female, Khun Tan, 3,000 feet, 

 February 14, 1932; one female, Pang Meton (Doi Nangka), May 2, 

 1931; four males, Kao Seming, Krat, October 12, 13, 1928, December 

 29, 1929-January 1, 1930; two males and four females, Koh Chang, 

 January 4-11, 1925, March 10, 11, 1930. 



Dr. W. L. Abbott took two females in Tenasserim (Tanjong Badak, 

 March 15, 1900 and Maliwun, March 25, 1900). Ho gives the soft 

 parts as: Iris red or orange-brown; bill and feet black. 



The United States National Museum possesses also one male, 

 Koh Chang, one male. Ok Yam, and one female, Koh Klum, south- 

 eastern Siam; two males and two females, southern Annam; and one 

 male, east-northeast of Phong Saly, Laos. 



The females are darker than the males. 



The above series averages lighter and somewhat smaller than 

 hopwoodi, but the differences are not great. 



Two males from northern Siam measure: Wing, 140-141; tail, 

 150-151; middle tail feathers, 93.5-95; culmen, 21-22. Five males 

 from southeastern Siam, two from southern Annam, and one male 

 from Laos: Wing, 138-146.5 (141.4); tail,''^ 138-149 (143.5); middle 

 tail feathers, 95-101 (97.2) ; culmen, 21.5-24 (22.9) mm. Four females 

 from northern Siam: Wing, 136.5-140 (138); tail, 136-143 (138.3); 

 middle tail feathers, 95.5-98.5 (96.6); culmen, 21.5-23.5 (22.5) mm. 



" Journ. Nat. Hist. Soc. Siam, vol. 5, p. 343, 1924. 



" The tails in tiie specimens from southern Annam and Laos are much worn and are not Included. 



