86° JOURNAL, NATURAL HIST. SOCIETY OF SIAM. Vol. 1. 
Iris, hight yellowish brown. Bill, brown above, flesh-coloured 
below. Legs, pinkish flesh. In the breeding season the mouth is 
black. 
Habits, ete. This small bird is common in the fields round 
Bangkok, especially those which are fallow. It is fond of soaring 
in the air, with rather a jerky flight, caused by tie momentary closing 
of its wings after every few beats, and, while so doing, it utters at 
regular intervals its sharp little staccato note of chi-chi. It dives to 
the ground from a height, with a sudden and almost vertical 
swoop, 
Distribution. I have been unable to trace any previous record 
of the occurrence of this bird in Siam. 
16 (3593). Arundinax aédon. The Thick-billed 
Warbler, 
Description. Length, about 197 mm. (7.75 in.). Upper p!um- 
age, fulvous olive-brown, brightest on the rump; lores, whitish. Chin 
and throat, buffish white; remainder of lower plumage, yellowish 
brown, paler on the centre of the abdomen. 
Iris, brown. Bill, dark brown above, flesh-colour below. 
Mouth, salmon-colour. Legs, plumbeons. 
As already mentioned, this bird is very similar in appearance 
to Acrocephalus orientalis, from which, however, it is readily distin- 
guished by its comparatively Jong first primary, vide Plate, 
page 83. 
Halnts, etc. This is a cold weather visitor, though apparently 
not very common. | have obtained it from October to April. 
Distribution. Gyldenstolpe also records this bird ( under the 
name of Lusciniola aédon) from Den Chai, in Northern Siam, where 
he obtained a single specimen. 
17 (410). Phylloscopus fuscatus. The Dusky Willow- 
Warbler. 
Description. Length, 183 mm. (5.25 in. ). Upper plumage, 
earthy brown, with a yellowish tinge on the rump ; a distinct whitish 
supercilium from the forehead to the nape. Jower plumage, yellowish 
brown, whiter on the chin, throat and centre of abdomen. 
