THE BIRDS OF NORTHERN THAILAND 485 



ACROCEPHALUS BISTRIGICEPS Swinhoe 



Black-browed Reed Warbler 



Acrocephalus bistrigiceps Swinhoe, Ibis, 1860, pp. 51-52 (Amoy, China). 

 Acrocephalus bistrigiceps, Deignan, Journ. Siam Soc. Nat. Hist. Suppl., 1931, 

 p. 348 (Chiang Mai) ; 1936, p. 114 (Chiang Mai). 



The black-browed reed warbler is a locally common winter visitor 

 to our area, recorded until now only from Mae Hong Son, Chiang 

 Mai, and Nan Provinces but almost certain to occur also in the re- 

 maining three. I have found it at Chiang Mai between November 2 

 (1935) and April 3 (1931) but have collected it at Thattafang as 

 early as October 13 (1936) and at Ban Huai Pa Khan as late as April 

 8 (1937). 



This species haunts exactly the same marshes as the other reed 

 warblers. 



It has the irides brown ; the maxilla brownish black ; the mandible 

 with the basal half fleshy or yellow, the apical half plumbeous or 

 horny; the rictus and interior of the mouth yellow; the tarsi dusky 

 flesh or fleshy horn; the toes light horny brown or plumbeous; the 

 soles yellow ; the claws light horny brown. 



The present form is very near to the paddy-field warbler in size 

 and coloration but may always be recognized by its having a con- 

 spicuous buff supercilium, edged above by a broad black or blackish- 

 brown band. 



LOCUSTELLA LANCEOLATA (Temminek) 



Lanceolated Grasshopper Warbler 



Sylvia lanceolata Temminck, Manuel d'ornithologie, ed. 2, vol. 4, 1840, pp. 614-615 

 (Mayence, error; type locality corrected to Russia, by Hartert, Vogel der 

 palfiarktischen Fauna, vol. 1, 1910, p. 553). 



Locustella lanceolata, Gyldenstolpe, Journ. Nat. Hist. Soc. Siam, 1915, p. 167 

 (listed) ; Ibis, 1920, p. 471 ("Northern Siam"). — Chasen and Boden Kloss, 

 Journ. Siam Soc. Nat. Hist. Suppl., 1932, p. 245 (Doi Suthep). 



Locustella lanceolata [partijn], Deignan, Journ. Siam Soc. Nat. Hist. Suppl., 

 1936, p. 114 (Chiang Mai [partim]). 



This secretive little bird is known from northern Thailand by only 

 four specimens: An unsexed example taken by Eisenhofer at Khun 

 Tan in 1914 and now deposited in Stockholm; a female shot by 

 Aagaard on Doi Suthep, 4,600 feet, in February or March 1931; a 

 female collected by me at Chiang Mai, November 26, 1931, and an- 

 other from Nong Phung (along the Chiang Dao road, some 46 or 48 

 km. north of Chiang Mai) , March 25, 1936. 



The lanceolated warbler keeps to the ground beneath the sedge 

 tussocks and, if seen at all, resembles nothing so much as a small 

 mouse; if made to fly, it drops almost immediately back into the 



