KUNGL. SV. VET. AKADEMIENS HANDUNGAR. HAND 56- N:o 2- 4f) 



Among thc birds collccted in Northern Siarn there are two specimens shol al Sop 

 Tue and one male from Koon Tan whieh 1 consider as belonging to this lönn of F. rufe- 

 scens. Tlie differences between F. r. beavani Wald. and F. r. poliocephala Anders, are, 

 however, very slight, the former race being characterizcd by the presence of a whitc eye- 

 brow whieh is absent in the last-mentioned form. 



This Grass Warbler was not uncommon throughout the open grassy plains of Norl h- 

 ern Siarn and it even oceured among the undergrowth — chiefly eonsisting of grass 

 of the lower hill-forests. It was generally seen in small parties and the tiny little birds 

 are very noisy keeping up a twittering notc whieh may be generally heard in sucli 

 localities whieh are suitable for this bird. 



71. Phylloscopus fuscata fuscata. Blytii. The Dusky Willow-Warbler. 



Phylloscopus fuscatus: Williamson I p. 42; Willianison II p. 86. 



£ Koon Tan 30 /i 1914. L = 125 mm.; W = 62 mm.; T = 54 mm.; C = 9 mm. - - $ Sop Tuc u f t 

 1914. L = 112 mm.; W = 56 mm.; T = 50 mm.; C = 9 mm. — Irides: brownish black. Bill: hora colour. 

 Legs: påle brown. 



According to Williamson (Journ. Siarn. Nat. Hist. Soc. Vol. I N:o 2 p. 87) the 

 Dusky Willow-Warbler »is fairly common» in the gardens of Bangkok during the cold 

 season. 



In Northern Siarn, however, it was rather rare, and I only collected two speci- 

 mens, both shot at the end of April. This species is foimd among low bushes and trees 

 especially in scrub jungles. 



72. Phylloscopus borealis borealis. Blås. — The Arctic Willow-Warbler. 



Phylloscopus borealis: Robinson & Kloss p. 65; Grant p. 76; Robinson II p. 150. 

 Acantlwpneustc borealis; Williamson I p. 43; Williamson II p. 87. 

 Phylloscopus borealis borealis: Robinson III p. 754. 



<£ Koh Lak 27 /n 1914. L =» 113 mm.; W = 60 mm.; T = 45 mm.; C = 10 mm.; Tarsus = 17 mm. 

 — Irides: brown. Bill: horn colour. Legs: påle brown. 



A single male specimen of the Arctic Willow Warbler was obtained at Koh Lak 

 on the 27th of November 1914. Winter visitor only. 



73. Phylloscopus nitidus plumbeitarsus. Swinh. Middendorffs Willow-Warbler. 



Phylloscopus nitidus plumbeitarsus: Gyldenstolpe I p. 29. 

 Acanthopneustc plumbeitarsus: Williamson I p. 43. 



ef Koh Lak u /ia 1914. L = 103 mm.; W = 58 mm.; T = 43 mm.; C = 8 mm. - - <£ Koh Lak 

 17 /i2 1914. L = 100 mm.; W = 56 mm.; T = 42,5 mm.; C = 8 mm. — Irides: brown. Bill: horny brown. 

 Legs: brown. 



During my stay at Koh Lak in the Siamese Malaya I obtained two specimens of 

 Middendorffs Willow Warbler, whieh only is wintering in Siarn. 



