48 NILS GYLDENSTOLPE, ZOOLOGICAL RESULTS OF THE SWEDISH ZOOLOGICAL EXPEDITIONS TO SIAM. 
S Koh Lak "/i 1914. L = 205 mm.; W = 117 mm.; T = 85 mm.; C = 18 mm. — J Koon Tan 
1914. W = 120 mm.; T = 88 mm.; C = 17 mm. — Irides: brown. Bill: horn colour. Legs: black. 
This species, as well as the next one, was not uncommon in Siam during the winter 
months. They were mostly observed high up among the mountains and sometimes 
very shy and difficult to get into a proper range. Sometimes they were, however, rather 
tame and rested on the roofs of the houses and bungalows. 
80. Monticola solitarius philippensis. P. L. 8S. Mitt. — The Eastern Blue 
Rock-Thrush. 
Monticola solitarius philippensis: Gyldenstolpe I p. 40; Robinson III p. 752; Gyldenstolpe II; Gyldenstolpe 
III p. 170. 
Monticola solitaria: Miller p. 357. 
Petrophila solitaria: Robinson & Kloss p. 64; Williamson I p. 44. 
© Pak Koh *4/3 1914. L = 206 mm.; W = 119 mm.; T = 88 mm.; C = 21 mm.; Tarsus 25,5 mm. 
— Trides: brown. Bill: black. Legs: brownish black. 
In habits the Eastern Blue Rock-Thrush resembles M. cyanea, LINN. and it was 
also found on the same localities. 
The specimen obtained is somewhat intermediate between MV. s. philippensis and 
M. s. pandoo Sykes. The Eastern Blue Rock-Thrush breeds in South Eastern Siberia, 
Manchuria, Eastern China, Corea, Japan and Formosa and is only found in Siam during 
the cold season. 
81. Monticola gularis. Swinn. — The White-throated Rock-Thrush. 
Monticola gularis: Robinson III p. 752. 
& Koon Tan. W = 98 mm.; T = 75 mm.; C = 15 mm.; Tarsus = 21 mm. 
A single specimen of the White-throated Rock-Thrush was obtained by Mr. EIsEn- 
HOFER’s native collector among the Koon Tan Hills. 
This species is only a migratory bird to Siam and has previously been found once 
in Cambodia and once according to Harrert (Vogel der Palaarktischen Fauna, Band I, 
p. 673), in the Malay Peninsula. Its breeding places are situated in the Ussuri valley 
in Eastern Siberia, Manchuria and Northern China. 
My specimen agrees well with the description given by HarTErr (tom. cit. p. 673), 
but it has the blue feathers of the crown tipped with reddish brown, which probably only 
is a sign of immaturity. The tail is also longer than recorded by HaRTERT, measuring 
75 mm. against HarTert’s 65—67 mm. In Harrert’s description there is probably 
a misprint about the length of the culmen which is stated to be 24 mm. It probably 
ought to be 14 mm. 
82. Henicurus leschenaulti indicus. Hart. — Leschenault’s Forktail. 
Henicurus leschenaulti: Gyldenstolpe III p. 170. 
o juv. Koon Tan 1/5 1914. L = 252 mm.; W = 106,5 mm.; T = 125 mm.; C = 22 mm.; Tarsus 
= 29 mm. —  juv. Doi Par Sakeng 1% 1914. L = 231 mm.; W = 103 mm.; T = 120 mm.; C = 21 mm; 
Tarsus = 29 mm. — Irides: brownish black. Bill: black. Legs: flesh colour. 
