BIRDS FROM SIAM AND THE MALAY PENINSULA 449 



male and not a female as marked. If correctly allocated it differs 

 from the majority of the species of the genus in having an inter- 

 mediate plumage; most of the species molt from the spotted plumage 

 of the young directly into the blue of the adult male. This seems 

 to be the first record of the form for Peninsular Siam. 



CYORNIS TICKELLIAE SUMATRENSIS (Sharpe) 



Siphia sumatrensis Sharpe, Catalogue of the birds in the British Museum, vol. 4, 



p. 451, 1879 (Sumatra). 

 Cyornis rufigastra indochina Chasen and Kloss, Bull. Brit. Orn. Club, vol. 48, 



p. 73, 1928 (Daban, South Annam) ; Bull. Raffles Mus., no. 2, p. 35, pi. 1, 1929. 



Two m.ales and three females, Bangnara, Patani, May 23, 1924, 

 July 14-16, 1926; one female (marked male), Yala, Patani, February 

 1, 1931; one male, Rao Luang, Nakon Sritamarat, October 6, 1930; 

 two males, Sichol, Bandon, May 21, 22, 1930; one male, Koh Lak, 

 June 22, 1933; one female, Sam Roi Yot, November 11, 1932; two 

 males and one female, Muang Kanburi, April 9-12, 1928; four males, 

 Pak Chong, March 1, 1924, May 8-18, 1925; one immature male. 

 Lam Klong Lang, Pak Chong, June 15, 1925; one male, Pak Sok, 

 August 18, 1926; two males, Nong Khor, near Sriracha, September 22, 

 1925, March 21, 1926; one male, BungBorapet, July 1, 1932; one male, 

 Chomtong, November 30, 1928; two males, Knong Phra, Pak Chong, 

 April 15-16, 1929; one male. Ban Mekok, October 20, 1932. 



Dr. W. L. Abbott took two males and a female in Trang, February 

 15 and January 23, 1897, and January 21, 1899. 



In this species the male is dark tyrian blue above, the superciliaries 

 and forehead lighter blue; lores blackish; throat and chest ochraceous- 

 orange; breast and belly white; the dark blue of the cheeks is con- 

 tinued across the chin in a very narrow line, in some specimens hardly 

 noticeable. Female a lighter blue above, lores whitish; chest and 

 throat like the male; breast and belly white; cheeks lighter blue than 

 the back, and tliis sometimes continued across the chin as a very 

 narrow line. The male is much like the same sex in the rubeculoides 

 group, but the latter is rather a darker blue, and the blue extends from 

 the chin onto the throat and from the sides of the neck onto the 

 sides of throat and chest, leaving the ochraceous-orange throat and 

 chest as a V-shaped wedge; the blue comes dov/n from the chin for 

 about 11 mm; in sumatrensis it is only about 4 mm or less. Ten males 

 measure: Wing, 65-71 (67.9); culmen, 10.5-12 (11.5) mm. 



This form ranges over all Siam, and in the Malay Peninsula as far 

 south as Malacca, southern French Laos, Cochinchina, southern 

 Annam, and Sumatra. 



