KUNGL. SV. VET. AKADEMIENS HANDLINGAR. HAND 56- N:o 2. 47 



77. Turdus aureus angustirostris. Gyldenstolpe. 1 



Orcocincla dauma; Gyldenstolpe 111 p. 170. 



ef Koon Tan, May 1914. W = 145 mm.; T = 118 mm.; C = 21 mm.; Tarsu 32 mm. - I ad 



Koon fan, May 1914. W = 146 mm.; T = 106 mm.; C = 21 mm.; Tarsus == 32 mm. 



Similar to Turdus aureus horsfieldi Bp. but the black tips to thc feathcrs of the 

 upper parts of the body and of the abdomen much larger and the whole colouration 

 paler. Like T. 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 Riciimond 

 under the name of Oreocichla horsfieldi affinis. The type locality for this form was 

 Träng in Lower Siarn. According to Richmond the second primary falls between the t hird 

 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 coramon. 



78. Turdus obscurus. Gm. — The Dark Ouzel. 



Turdus obscurus: Ilobinson å Kloss p. G4; Robinson III p. 753. 

 Merula ohscura: Muller p. 357. 



J 1 Hue Sai 17 /i 1915. L = 215 mm.; W = 120 mm.; T = 88 mm.; C = 17,2 mm.; Tarsus = 28 mm. 

 — Iridis: brown. Bill: yellowisb brown. Legs: påle brown. 



The Dark Ouzel was only observed near Hue Sai, a small creek running from the 

 hills bordering Tenasserim and Siarn 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 Siarn, 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 Ornitb. Monatsber. 1916. No. 2 p. 28. 



