78 NILS GYLDENSTOLPE, ZOOLOGICAL RESULTS OF THE SWEDISH ZOOLOGICAL EXPEDITIONS TO SIAM. 
142. Muscitrea grisola grisola. Buiyru. — The Grey Flycatcher. 
Muscitrea grisola: Robinson & Kloss p. 54; Robinson II p. 148; Robinson III p. 743. 
Jf Koh Lak 2/11 1914. L = 148 mm.; W = 85,7 mm.; T = 70 mm.; C = 12 mm. — ¢ Koh Lak 
26/4, 1914. L = 140 mm.; W = 77 mm.; T = 63 mm.; C = 12 mm. — ff Koh Lak 711 1914. L = 146 
mm.; W = 82 mm; T = 64 mm.; C = 12 mm. — ¢ Koh Lak !%/2 1914. L = 155 mm.; W = 82 mm; 
T= 65 mm; C= 12,6 mm. — @ Koh Lak */; 1915. L=147 mm; W = 79,6 mm.; T = 62 mm.; 
C=12 mm. — @ Koh Lak 1/2 1914. L155 mm; W = 81 mm; T = 67 mm; C = 12 mm. — 
? Koh Lak °9/;, 1914. L = 135 mm.; W = 80,5 mm.; T = 64 mm; C = 12 mm. — Irides: brown. Bill 
black. Legs: plumbeous. 
The Grey Flycatcher was rather common in a bamboo-jungle near the sea-shore 
north of the Koh Lak Bay. All other authors state that it is entirely confined to the 
mangroves, but I never observed it in such kind of vegetation. The country was per- 
fectly dry where I met with this species and covered with bamboos. However, a fairly 
large mangrove swamp was situated not very far away. 
A male specimen shot on the 26th of November 1914 has the outer webs of the 
secondaries and those of the inner primaries earthy brown, the bill is horn-coloured instead 
of black. This specimen is most probably a not fully adult bird in its first plumage. 
143. Gerygone griseus. GYLDENSTOLPE.' 
Plate 2. fig. 2. 
Q Koh Lak !/12 1914. = 85 mm.; W = 51 mm.; T = 39 mm.; C = 8 mm.; Tarsus = 14 mm. 
— Irides: black. Bill: black. Legs: black. 
A few specimens of this small bird which J have been compelled to describe as new, 
were observed in an almost impenetrable mangrove swamp, situated near the sea-shore 
at Koh Lak in the Siamese Malaya. The birds were rather shy and difficult to make 
out among the vegetation and only a female specimen was obtained. 
It seems to be nearest to Gerygone modighani SatvaD. from the Malay Peninsula, 
but differs from that species in lacking the dusky horse-shoe mark on the sides of the 
fore-neck. Another allied form is Gerygone flaveola Cas. which inhabits the island of 
Celebes. 
Description: General colour above smoky brown, the head being of the same colour; 
least and median wing-coverts smoky brown a little darker than the colour of the back; 
primaries dark dusky brown with narrow brownish white margins on the outer webs of 
the feathers; secondaries blackish brown; tail feathers dusky brown with a subterminal 
black band and a white spot near the tip; the two central pairs of tail-feathers have this 
white tip confined to the inner web, on the outer tail-feathers the white tip is on the outer 
web; lores greyish white; feathers round the eye smoky brown; ear-coverts smoky brown 
and of the same colour as the crown and nape; cheeks, throat, breast and abdomen pale 
sulphur yellow, brighter on the throat; under tail-coverts white; flanks and sides of the 
body pale brownish olive; thighs yellowish white; under wing-coverts and axillaries 
white, washed with yellow especially on the outer edge of the wing; quills brown below, 
whitish on their inner webs. 
! Ornith. Monatsber. 1916. No. 2, p. 27. 
