78 NILS GYLDENSTOLPE, ZOOLOGICAL RESULTS OF THE SWEDISH ZOOLOGICAL EXPEDITIONS TO SIAM. 



142. Muscitrea grisola grisola. Blyth. — The Grey Flycatcher. 



Muscitrea grisola: Robinson & Kloss p. 54; Robinson II p. 148; Robinson III p. 743. 



<$ Kob Lak 27 /n 1914. L = 148 mm.; W = 85,7 mm.; T = 70 mm.: C = 12 mm. — J Koh Lak 

 26 /n 1914. L = 140 mm.; W = 77 mm.; T = 63 mm.; C = 12 mm. — <$ Koh Lak 26 /n 1914. L = 146 

 mm.; W = 82 mm.; T = 64 mm.; C = 12 mm. — $ Koh Lak 16 / )2 1914. L = 155 mm.; W = 82 mm.; 

 T = 65 mm.; C = 12,6 mm. — $ Koh Lak 21 /i 1915. L = 147 mm.; W = 79,6 mm.; T = 62 mm.; 

 C = 12 mm. — $ Koh Lak ie /i2 1914. L = 155 mm.; W = 81 mm.; T = 67 mm.; C — 12 mm. — 

 ? Koh Lak 2H /n 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. 1 



Plate 2. fig. 2. 



$ Koh Lak l /u 1914. L = 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 I ha ve 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 

 ont among the vegetation and only a female specimen was obtained. 



It seems to be nearest to Gerygone modigliani Salvad. 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 Cab. 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 spöt near the tip; the two central pairs of tail-feathers ha ve 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; checks, throat, breast and abdomen påle 

 sulphur yellow, brighter on the throat; under tail-coverts white; flanks and sides of the 

 body påle 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. 



1 Ornith. Monatsber. 1916. No. 2, p. 27. 



