BIRDS FROM SIAM AND THE MALAY PENINSULA 237 



CHRYSOCOLAPTES VAUDUS XANTHOPYGIUS Finsch 



Chrysocolaptes xanthopygius Finsch, Notes Lej'den Mus., vol. 26, p. 34, 1905 

 (upper Mahakan River, Dutch Borneo). 



One male, Kao Luang, Nakon Sritamarat, July 13, 1928; one male 

 and three females, Kao Chong, Trang, August 27-31, 1933; one 

 female, Kao Soi Dao, Trang, December 29, 1933. 



Dr. W. L. Abbott collected three males and one female at Lay- 

 Song Hong, Trang, November 10-11, 1896, January 1, 1897, and 

 one male and one female at Tanjong Peniabong, east cost of Johore, 

 July 23-24, 1901. 



He gives the soft parts as: Iris orange-red, reddish brown, or 

 brownish yellow; upper mandible dark horn brown, lower mandible 

 yellow; feet pale yellow brown (males); iris orange brown or brown; 

 upper mandible dark horn brown or pale horn brown, lower mandible 

 yellov.ish or greenish white; feet leaden or dusky greenish (females). 



In most of the above series the males have the center of the mantle 

 white with a slight yellow wash; the rump cadmium, orange. In 

 one male from Trang (no. 160191) the rump is cadmium orange 

 stained with scarlet red and one or two other males show a slight red 

 v/ash on the rump. 



The few specimens examined from Sumatra and Borneo do not 

 seem to differ materially from the mainland form. 



Six males from the Alalay Peninsula measure: Wing, 157-166 

 (159.8); tail, 79.5-86.5 (82.5); culmen, 43-49 (45.4) mm. Four 

 males from Sumatra (2), Banka (1), and Borneo (1); Wing, 163-165 

 (163.9); tail, 81-90 (85.5); culmen, 43-46 (44.9) mm.. Six females 

 from the Malay Peninsula: Wmg, 154-165 (159.2); tail, 77-91 (83.5); 

 culmen, 40-44.5 (42.2) mm. Four females from Sumatra (2) and 

 Borneo (2): Wmg, 150-162.5 (154.9); tail, 78-88 (84); culmen, 

 39-43 (40.7) mm. 



The form ranges from Borneo, Banka, and Sumxatra to the Malay 

 States and Peninsular Siam. Robinson and IQoss ^^ state that a 

 male from Lamra, a female from Koh Khau, a male from Chong, 

 and a pair from Kao Ram were the sole records for Siam when they 

 wrote. 



C V. validus (Temminck) is confined to Java and is quite distinct 

 from xanthopygius. The mainland, Sumatran, and Bornean form 

 should doubtless be recognized as a distinct species. The only 

 specimen I have examined from Java, a female, has the back and rump 

 clay color instead of white or yelloMdsh white and seems to be adult. 



" Journ. Nat. Hist. Soc. Slam, vol. 6, p. 197, 1923. 



33527—38 16 



