192 BULLETIN 17 2, UNITED STATES NATIONAL MUSEUM 



Koh Chang, January 15, 1926; one female, Tha Yai, Nakon Srita- 

 marat, July 26, 1926; one male, Nakon Sritamarat, July 8, 1928; 

 two males and one female, Tha Lo, Bandon, September 15 and 17, 

 1931; one male and one female, Kao Soi Dao, Trang, January 5 and 

 12, 1934; one male, Hm Lap, eastern Siam, September 30, 1932. 



Dr. W. L. Abbott collected six males, three females, and one unsexed 

 in Trang (Prahmon, March 10-31, 1896; Lay Song Hong, October 23, 

 1896; TelibonIsland,March 28, 1896; Trang, January 19 and February 

 24, 1899); one female, Pulo Langkawi, December 2, 1899; one male, 

 Bok Pyin, Tenasserim, February 19, 1900; and one male, Heifer 

 Island, Mcrgui Archipelago, March 6, 1900. 



Dr. Abbott gives the color of the soft parts as (male): Iris dark 

 brown, in some cases with another paler ring; bill and casque yellowish 

 wiiite, a black patch at the front end of the latter, base of lower 

 mandible and back of casque black; orbital skin bkiish white, slaty 

 black in front of eye and at posterior angle; naked skin at base of 

 lower mandible bluish white; gular pouch slaty; feet plumbeous, 

 claws black. Another male has a narrow black line along the com- 

 missure. The female does not seem to differ materially from the 

 male except the tip of the bill is black and the base of the lower 

 mandible has a brick-red spot near the base. The weight of one 

 male from Trang is given as 1% pounds. 



No two adult males in the above series have the casque exactly 

 the same shape, probably because of age. The majority are evidently 

 younger birds, with the casque not fully developed. It probably 

 takes more than one year for the casque fully to develop and prob- 

 ably longer for it to reach the final stage. The male with the most 

 highly developed casque has a large white mark on the iimer web of 

 one and a smaller white mark on the outer web of the other central 

 tail feather at the tip ; probably this is a very old bird. 



The wings of five fully adult males measure 265, 265, 270, 273, 

 and 274 mm. These are all from southern or Peninsular Siam. 

 The wing of the male from Heifer Island measures 260 mm. The 

 wings of five adult females measure 259, 260, 261, 265, and 265 mm. 

 These are also from southern or Penmsular Siam. Neither m the 

 male nor the female does the maximum reach Stuart Baker's maxi- 

 mum,*' though the minimum is slightly greater. His large specimens 

 must be from more northern birds. 



The form ranges from Burma east to Indo-China and south to 

 Siam and do\\Ti the Perimsula as far as Kedah. 



Gyldenstolpo *^ reports it quite common throughout the whole 

 country. Deignan *^ had only one record for Doi Sutep at 2,000 feet 



*■> The fauna of British India, Birds, ed. 2, vol. 4, p. 290, 1927. 



« Ibis. 1920, p. 586. 



« Joura. Siam Soc. Nat. Hist. Suppl., vol. 8, p. 162, 1931. 



