KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 56. N:0 2. 47 
77. Turdus aureus angustirostris. GylLDENSTOLPY.’ 
Oreocincla dauma; Gyldenstolpe III p. 170. 
d Koon Tan, May 1914. W = 145 mm.; T = 118 mm.; C = 21 mm.; Tarsus = 32 mm. — 1 ad. 
Koon Tan, May 1914. W = 146 mm.; T = 106 mm.; C = 21 mm.; Tarsus = 32 mm. 
Similar to T'urdus aureus horsfieldi Br. but the black tips to the feathers of the 
upper parts of the body and of the abdomen much larger and the whole colouration 
paler. Like 7. a. horsfieldi the tail also consists of 14 feathers but the wing formula is 
somewhat different. In the new form the second primary falls between the fifth and the 
sixth, the fourth being the longest. Another allied form has been described by RicHMonD 
under the name of Oreocichla horsfieldi affinis. The type locality for this form was 
Trang in Lower Siam. According to Ricumonp the second primary falls between the third 
and fourth and the third primary is the longest. The bill is said to be smaller than in 
typical horsfieldi and the wing longer, viz. 142 mm. 
As seen by the measurements given above, the new form has still longer wings than 
O. h. affinis. The tail is also much longer and the bill and tarsus shorter. 
This new form was only obtained among the mountains near Koon Tan and it was 
by no means common. 
78. Turdus obscurus. Gm. — The Dark Ouzel. 
Turdus obscurus: Robinson & Kloss p. 64; Robinson III p. 753. 
Merula obscura: Miller p. 357. 
3 Hue Sai 17/1 1915. L=215 mm. W = 120 mm.; T= 88 mm.; C= 17,2 mm.; Tarsus = 28 mm. 
— Iridis: brown. Bill: yellowish brown. Legs: pale brown. 
The Dark Ouzel was only observed near Hue Sai, a small creek running from the 
hills bordering Tenasserim and Siam on about Lat. N. 11° 50’. 
Even here it was rare and only a few specimens were met with. They occured in 
a very thick and almost impenetrable brush-jungle and were rather shy. When disturbed 
in some way, they at once dived down into the tangle of vegetation though appearing 
soon again to have a look at the disturber. 
This species seems to be a common cage-bird among the natives both in Bangkok 
and in the villages on the Peninsula. It is only found in Siam, the Malay Peninsula, 
Southern China, the Sunda Islands and the Philippines during the winter months, having 
its breeding places in Siberia. 
79. Monticola cyanea. Linn. — The Western Blue Rock-Thrush. 
Monticola cyanea: Gyldenstolpe III p. 170. 
Petrophila cyanus: Williamson I p, 44. 
Petrocincla affinis: Gould p. 151. 
1 Ornith. Monatsber. 1916. No. 2 p. 28. 
