KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 56. N:0 2. 45 
Among the birds collected in Northern Siam there are two specimens shot at Sop 
Tue and one male from Koon Tan which I consider as belonging to this form of I’. rufe- 
scens. The differences between F. r. beavani WALD. and F. r. poliocephala ANDERS. are, 
however, very slight, the former race being characterized by the presence of a white eye- 
brow which is absent in the last-mentioned form. 
This Grass Warbler was not uncommon throughout the open grassy plains of North- 
ern Siam and it even occured among the undergrowth—chiefly consisting 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 note which may be generally heard in such 
localities which are suitable for this bird. 
71. Phylloscopus fuscata fuscata. BuytH. — The Dusky Willow-Warbler. 
Phylloscopus fuscatus: Williamson I p. 42; Williamson II p. 86. 
od Koon Tan %%; 1914. L = 125 mm.; W = 62 mm.; T = 54 mm.; C = 9 mm. — @ Sop Tue 4/4 
1914. L=112 mm.; W = 56 mm.; T = 50 mm.; C = 9 mm. — Irides: brownish black. Bill: horn colour. 
Legs: pale brown. 
According to WiLLiamson (Journ. Siam. 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 Siam, however, it was rather rare, and I only collected two speci- 
mens, both shot at the end of April. This species is found among low bushes and trees 
especially in scrub jungles. 
Fhe, fate ¢ 
72. Phylloscopus borealis borealis. Bras. — The Arctic Willow-Warbler. 
Phylloscopus borealis: Robinson & Kloss p. 65; Grant p. 76; Robinson II p. 150. 
Acanthopneuste borealis; Williamson I p. 43; Williamson II p. 87. 
Phylloscopus borealis borealis: Robinson III p. 754. 
o& Koh Lak "11 1914. L—=113 mm.; W = 60 mm.; T = 45 mm.; C = 10 mm; Tarsus = 17 mm. 
— Jrides: brown. Bill: horn colour. Legs: pale 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. Swinu. — Middendorff’s Willow-Warbler. 
Phylloscopus nitidus plumbeitarsus: Gyldenstolpe I p. 29. 
Acanthopneuste plumbeitarsus: Williamson I p. 43. 
od Koh Lak “/i2 1914. = 103 mm.; W = 58 mm.; T = 43 mm; C = 8 mm. — & Koh Lak 
fy 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 
Middendorff’s Willow Warbler, which only is wintering in Siam. 
