124 NILS GYLDENSTOLPE, ZOOLOGICAL RESULTS OF THE SWED1SH ZOOLOGICAL EXPEDITIONS TO SIAM. 



of Central Siarn where numbers of speeimens were seen flying to and fro near the ground 

 in searcli of food. 



In the Siainese Malaya it was ne ver obseryed during niy stay there from November 

 1914 to February 1915. 



250. Circus aeruginosus seruginosus. Linn. — The Marsh-Harrier. 



Oircus (e nig inösas: Gyldenstolpe I p. 63; Williamson 1 p. 17; Muller p. 430; Robinson & Kloss p. 11. 



$ Koh Lak 18 /ia 1914. L = 480 mm.; W = 378 mm.; T = 238 mm.; C = 21 mm. — <? Koh Lak 

 81 n 1914. L = 550 mm.; W = 398 mm.; T = 255 mm.; C = 22 mm. — $ Koh Lak 16 /ia 1914. L = 528 

 mm.: W = 411 mm.; T = 254 mm.; C = 24 mm. — $ Koh Lak 13 /i 2 1914. L = 490 mm.; W — 389 mm.: 

 T = 240 mm.; C = 22 mm. — Irides: yellowish brown. Bill: blackish. Legs: yellow. 



The Marsh-Harrier is a common winter visitor to the plains and open country of 



Central Siarn and the »Siarnese Malaya. It chiefly haunts marshy ground or rice-fields. 



All the specimens obtained are young birds and not a single adult was met with. 



251. Astur trivirgatus rufitinctus. McClell. — The Crested Goshawk. 



Lophospieias trivirgatus: Gyldenstolpe II; Gyldenstolpe III p. 234; Robiuson I p. 90. 



<$ Pak Koh l6 A 1914. L = 376 mm.; W = 221 mm.; T = 197 mm.; C = 18 mm. 

 yellow. Bill: horn colour. Legs: yellow. 



Irides: bright 



The Crested Goshawk seems to be verv rare and only a few speciniens were ob- 

 sen ed in Northern Siarn besides the fine male which was obtained at Pak Koh on the 

 L6th of April 1914. 



It seems to avoid evergreen jungles and the lower valleys with their dense vegeta- 

 tion, and it was only met with in the deciduous forests or in thin tree jungle. 



This subspecies is distinguished from the typical Astur trivirgatus Temm., which 

 inhabits the Indian Peninsula and Ceylon, by its largcr size. 



252. Astur badius poliopsis. Hume. — The Burmese Shikra. 



Astur badius poliopsis: Oustalet 1899 p. 238; Gyldenstolpe III p. 234. 



Astur poliopsis: Gyldenstolpe 1 p. 63; Robinsou & Kloss p. 22; Gyldenstolpe il. 



Astur badius: Williamson I p. 47. 



Nisus badius: Finsch & Conrad p. 345. 



Accipiter badius: Gould p. 151. 



Micronisas poliopsis: Muller p. 4 30. 



Sox 



Locality 



Date 



Length 



Wing 



Tail 



Culmen 



Tnrsus 









mm. 



mm- 



mm. 



mm. 



min. 



9 



Koon Tan 



'•'/,. 1914 



359 



213,5 



170 



15 



47,5 



9 



Pak Koh 



e /« 1914 



:«9 



215 



175 



15 



50 



9 



Bång Huo Pong 



8 /r, 1914 



340 



209 



179 



15 



48 



ö" 



Pak Tha 



1J / 3 1914 



300 



18G 



158 



14,5 



45 



ef 



Koh Lak 



'»/i 1915 



310 



187 



156 



12 



40 



<? juv. 



Bång Hue Pong 



,G /r. 1914 



300 



185 



153 



14 



46 



9 juv. 



Bång Hue Pong 



27 /r, 1914 



295 



181 



133 



14 



47 



Irides: yellow or brick red (adult), dirty yellow (juv.). Bill: plumbeous (adult), black (juv.). Legs: yellow. 



