386 BULLETIN 17 2, UNITED STATES NATIONAL MUSEUM 



near Kao Nom Plu, February 19, 1897; Trang, February 11 and 

 March 7, 1897) ; and one female, Victoria Point, Tenasserim, January 3, 

 1900. He also took a nest and three eggs at Trang, March 7, 1897. 

 He describes the iris as dark brown, bill and feet black. 



No constant differences in color can be detected between specimens 

 from Peninsular Siam and those from northern Siam. Sex for sex, 

 the birds increase in size from the south toward the north, but the 

 differences are slight so far as Siam is concerned. Specimens from 

 French Indo-China seem to agree with Siamese birds in size and color. 



Ten males from Peninsular Siam measure: Wing, 78-8G (82.3); 

 tail, 78-87 (82.3); culmen, 15-16.5 (15.9) mm. Ten males from 

 northern Siam: Wing, 79-89 (83.6); tail, 80-90 (83.4); culmen, 15-17 

 (16.1) mm. Seven males from Laos and Tonkin: Wing, 83-86 (84.9); 

 tail, 82-90 (85.9); culmen, 15-16.5 (15.7) mm. 



The typical race, 0. j. jocosa, comes from China and is a larger form, 

 of which no specimens have been examined. La Touche "" gives the 

 measurements as follows: Wing, 92; tail, 91; culmen, 15 mm. Two 

 males of 0. j. emeria from the Sahvin River, western Yunnan, in the 

 United States National Museum measure: Wing, 92-95; tail, 90-97; 

 culmen, 16.5-17 mm. 



In the above scries there are three immature specimens (one male 

 and two females). One female was collected at Haad Yai, July 12, 

 one female at Doi Hua Mot, August 29, and the male at Ban Ta Yai, 

 July 9. All three are of nearly adult size, but the red has not appeared 

 under the eye, and the under tail coverts in the two females are light 

 salmon-orange; in the male a few scarlet under tail coverts are coming 

 in. The pileum is dark brown instead of black. 



The range of 0. j. eryihrotis extends from Singapore northward 

 through Peninsular Siam to Tenasserim and northern Siam and east- 

 ward to Laos, Tonkin, South Annam, and Cochinchina. Apparently 

 it is common all over Siam. 



Herbert ®' found it breeding at Paknampo and took one clutch 

 of two eggs, but he gives no data. 



OTOCOMPSA FLAVIVENTRIS FLAVIVENTKIS (TickelO 



Vanga flaviventris Tickell, Journ. Asiat. Soc. Bengal, vol. 2, p. 573, 1833 

 (Dampara and Dholbhum, Bengal). 



Six males, Khun Tan, 4,000 feet, November 23, 1928; October 18- 

 28, 1929, September 7, 1930; two males, Mekhan, February 6 and 8, 

 1932; one male, Muang Pai, December 28, 1932. The wings of nine 

 males measure 84-89 (85.4) mm. 



*> A handbook of the birds of eastern China, vol. 1, pt. 1, p. 95, 1925. 

 •• Journ. Nat. Hist. Soc. Siam, vol. 6, p. 06, 1923. 



