BIRDS FROM SIAM AND THE MALAY PENINSULA 421 



coverts, sides of head, and cheeks are white, producing a demicollar 

 on the sides of neck. M. Delacour ^^ thinks this is a dimorphic phase 

 Hkely to occur anywhere within the range of the species. 



De Schauensee ^^ records two males taken at Chiengmai, 4,500-5,500 

 feet, July 8 and 21, and Deignan ^^ a specimen taken at the same place 

 on July 16, 1935. 



Family SYLVIIDAE: Old World Warblers 



ACROCEPHALUS ARUNDINACEUS ORIENTALIS (Teimnlnck and Schlegel) 



Salicaria lurdlna orientaUs Temminck and Schlegel, in Siebold's Fauna Japonica, 

 Aves, p. 50, pi. 20b, 1847 (Japan, Borneo, Makassar, and Sumatra). 



One male and two females, Bangkok, September 21, 1933, Septem- 

 ber 23, 1924, and April 5, 1926; one female, Korat, February 14, 1929; 

 one male, Chantabun, March 15, 1930. 



This bird is not uncommon in winter apparently in the vicinity of 

 Bangkok, as it has been reported from there by a number of collectors. 

 Deignan ^^ reports it locally common in winter in reed beds at Chieng- 

 mai and as leaving in March. De Schauensee " took specimens at 

 Meldong, November 17; Hua Mak, December 17; Tap Chang, April 

 4; and Petriu, October 23. Robinson and Kloss '^ record two females 

 from Namxchut, Pakchan, February 24-26. Miiller ^^ took one on 

 Salanga (Puket), February 28. 



The form breeds in northern China, eastern Siberia, and Japan and 

 migrates to southern China, Indo-China, Burma, Assam, Slam, the 

 Malay States, Sumatra, Java, Borneo, and the Philippines to winter. 



LOCUSTELLA CERTHIOLA (Pallas) 



Motacilla certhiola Pallas, Zoographia Rosso-Asiatica, vol. 1, p. 509, 1827 

 (beyond Lake Baical). 



One immature female, Bangkok, September 21, 1923; one adult 

 female, Meldong, January 5, 1924. 



This species breeds in eastern Siberia and migrates to southern 

 China, Indo-China, Assam, Burma, eastern Bengal, and Siam to winter. 



Williamson ^° records it from Bangkok; Robinson and I\Ioss ^^ from 

 Kandhuli, Chaiya, Peninsular Siam, September 29, and Pulo Condore.^' 

 Apparently it is not a common winter visitor to Siam. 



" L'Oiseau, new ser., vol. 2, p. 435, 1932. 



•* Proc. Acad. Nat. Sci. Philadelphia, vol. 86, p. 212, 1934. 



" Joiirn. Siam Soc. Nat. Hist. Suppl., vol. 10, p. 114, 1936. 



" Journ. Siam Soc. Nat. Hist. Suppl., vol. 8, p. 148, 1931. 



" Proc. Acad. Nat. Sci. Philadelphia, vol. 86, p. 228, 1934. 



" Journ. Nat. Hist. Soc. Siam, vol. 5, p. 319, 1924. 



" Die Ornis der Insel Salanga, p. 10, 1882. 



"> Journ. Nat. Hist. Soc. Siam, vol. 1, p. 197, 1915. 



" Journ. Nat. Hist. Soc. Siam, vol. 6, p. 318, 1924. 



" Journ. Nat. Hist. Soc. Siam, vol. 4, p. 89, 1921. 



