KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 56. N:0 2. 13] 
The immature birds have the frontal band, lores, supercilium and a line down the 
nape bright ferruginous instead of white as in the adult birds. In the young birds the 
bill is dirty yellow instead of plumbeous. 
270. Poliohierax insignis. Wap. — Feilden’s Hawk. 
Poliohierax insignis: Gyldenstolpe I p. 64; Gyldenstolpe IH p. 234; Oustalet 1899 p. 234. 
od Koon Tan, May 1914. W=145 mm.; T= 140 mm; C = 12,5 mm. — 2 Koon Tan, April 1914. 
W = 152 mm.; T = 129 mm.; C = 13 mm. 
Feilden’s Hawk seems to be rather rare and also very locally distributed. During 
my previous journey I met with it on the Korat plateau in Eastern Siam but during my 
last Expedition I never myself met with it. However, Mr. EISENHOFER’s native collector 
obtained several specimens at Koon Tan and its neighbourhood, and to him I am indebted 
for two fine specimens. 
271. Falco sp. 
A single specimen of a medium-sized Falcon was observed in a precipitous lime- 
stone mountain a few miles south of Koh Lak in the Siamese Malaya. It most probably 
was a specimen of the Indian Hobby (Falco severus Horsr.) which species recently has 
been obtained in Bangkok by WILLIAMSON (vide. Siam. Journal. Nat. Hist. Soc. Vol. I, 
No. 3, p. 198). 
272. Falco tinnunculus saturatus. Buiytu. — The Kestrel. 
Cerchneis tinnunculus: Robinson & Kloss p. 29. 
Q@ Koh Lak */1 1914. L = 345 mm; W = 245 mm.; T = 182 mm.; C = 15 mm.; Tarsus = 34 
mm. — Irides: brown. Bill: plumbeous (tip black). Legs: yellow. 
Probably a winter visitor only and not very common. Most often it was seen in 
Central Siam, where it frequented the large sometimes swampy plains which occur here 
and there. In the Siamese Malaya it was, however, more abundant and several specimens 
were observed in the bamboo-jungles and in the open country near the coast. 
Falco tinnunculus saturatus BuyTH. is very similar to both F. t. tinnunculus Linn. 
and F. t. japonicus Temm. & ScHLEG. From the former it is separated by having a much 
darker colouring and from the latter it is distinguished by its smaller size. 
F. t. japonicus which breeds in Japan and migrates to Southern China and Hainan 
may eventually be found in Siam, most probably in the Northern parts of the country 
and more material from different localities and seasons is highly desirable. 
Fam. Vulturide. 
273. Pseudogyps bengalensis. Gm. — The Indian White-backed Vulture. 
Pseudogyps bengalensis: Gyldenstolpe I p. 62; Williamson I p. 47; Gairdner p. 31; Grant p. 115; Oustalet 
1899 p. 229; Gairdner p. 151; Miller p. 430. 
