40 NILS GYLDENSTOLPE, ZOOLOGICAL RESULTS OF THE SWEDISH ZOOLOGICAL EXPEDITIONS TO SIAM. 
The Thick-billed Shrike which has previously not been recorded from Siam in- 
habits the Malay Peninsula, Sumatra, Java, Borneo and China north to Corea. 
Though I observed several specimens among the mountanous regions of Northern 
Siam I only shot a single male specimen. It is in full plumage and probably a very old 
bird because there are no traces of any barring on the flanks or sides of the body. On 
the outer tail-feathers there is only a very small white tip and a V-shaped blackish brown 
subterminal mark. 
59. Lanius hypoleucus siamensis. GyLDrNnstoLtPr.’ — The Siamese Shrike. 
Plate 2. fig. 1. 
Lanius colluroides: Gyldenstolpe III p. 167. 
do Pong Pa Oh. **/s 1914. L = 200 mm.; W = 89 mm.; T = 102 mm.; Tarsus = 21 mm. — 9 Koh 
Lak 1/12 1914. I. = 169 mm.; W = 85,5 mm.; T = 95,5 mm.; C = 12 mm.; Tarsus = 21 mm. — 1 ad. 
Koon Tan 1914. W = 84 mm.; T = 91 mm.; C = 12,5 mm.; Tarsus = 21 mm. — Irides: brown. Bill: horn 
colour. Legs: black. 
This species was fairly common at the outskirts of the forests and in the shrub- 
jungles of Northern Siam but it also occured in the Siamese Malaya where one fine 
specimen in full plumage was obtained on the 17th of December 1914 and constitutes 
the type of this new subspecies. 
Description: Fore part of crown black, gradually passing over into the dark grey 
of the hind neck, nape and upper back; rest of the back, rump and upper tail coverts 
deep chestnut; feathers above the eye and ear-coverts deep black; lores and a line at the 
base of the bill pure white; quills and wing-coverts dark brown, the latter as well as the 
secondaries broadly margined with rufous brown; basal part of the inner primaries white, 
which colour dimishes in extent on the outer primaries, though forming a speculum; 
the four middle pairs of the tail-feathers blackish brown with white tips, which are very 
narrow on the two central pairs increasing in size on the next two pairs; the outermost 
two pairs almost white with only a blackish brown colour on the immediate neighbour- 
hood of the shafts which are pure black; quills below dusky and with a large white patch; 
throat pure white; rest of under parts creamy white with a rufous tinge on the flanks; 
thighs white with black bases to the feathers; wing lining pure white. 
60. Lanius nigriceps longicaudatus. Govu_p. — The Siamese Black-headed Shrike. 
Lanius nigriceps longicaudatus: Gyldenstolpe I p. 31. 
Lanius longicaudatus: Gould p. 151. 
Lanius nigriceps: Williamson I p. 43; Williamson II p. 89; Schomburgk p. 256; Finsch & Conrad p. 352; 
Oustalet 1903 p. 24; Gairdner p. 149. 
Not uncommon on the great alluvial plain of Central Siam. Outside Bangkok it 
also occurred and single specimens were often seen perching on a fence-post or on some 
low tree or bush. It has a harsh note which, however, is seldom heard, generally only 
when the bird has been frightened in some way. 
1 Ornith. Monatsber. 1916. No. 2 p. 28. 
