KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 56. WN:0 2. 31 
without a large material to compare with, it is hardly possible to identify the different 
races. However, my specimens fairly well agree with the description given by STUART 
Baker for Mirafra assamica marione, Mr. Stuart Baker has also quite recently de- 
scribed another new subspecies of a Bush Lark which he proposed to name after its 
discoverer Mirafra cantillans williamsoni (Bull. Brit. Ornith. Club. Vol. 36. N:o CCX p. 9. 
1915). This new form was obtained by Mr. W.J. F. WiLramson at the neighbourhood of 
Bangkok where it was said to be common and a resident. According to the description 
this form seems to be nearest to Mirafra philippensis Warpu. Rams. from the Philip- 
pines. They then belong to the Group which is characterized by having the outher tail- 
feather almost entirely white, with the dusky mark confined to the inner web only. 
In my collection there are no specimens from the neighbourhood of Bangkok, viz. 
the type locality of this new race. The Koh Lak specimens belong to quite another group. 
The light pattern on the outer tail-feathers is only confined to a narrow line on the outer 
webs of the feathers and is of a pale rufous colour. 
Among the mountains of Upper Siam another species was obtained viz. Mirafra 
microptera HumE. This species belongs to the same group as Mirafra assamica Mc. CLELL. 
The new race described as Mirafra cantillans williamsoni is probably only confined 
to the alluvial plain surrounding the Menam Chao Phaya river, where it seems to be a 
resident according to Mr. WILLIAMSON who has found its nest and eggs. If it migrates 
in some way during the cold season is still open to question. Anyhow no specimens 
were obtained during my stay in the Siamese Malaya from November 1914 to the end of 
February 1915. 
Fam. Motacillida. 
36. Motacilla alba leucopsis. Goutp. — The White-faced Wagtail. 
Motacilla alba leucopsis: Gyldenstolpe I p. 41; Gyldenstolpe III p. 171. 
Motacilla alba: Williamson I p. 44. 
When going down the Meh Ping river from Chieng Mai to Paknam Po during the first 
half of October 1914 the White-faced Wagtail was very common indeed along the course 
of the river. It either rested on the stranded teak-logs or on the numerous sandbars, 
and was generally seen single, though several specimens could occur quite close to each 
other. Also observed on the paddy-fields of Northern and Central Siam. 
Winter visitor only. 
37. Motacilla boarula melanope. Part. — The Grey Wagtail. 
Motacilla boarula melanope: Gyldenstolpe I p. 41; Gyldenstolpe II; Gyldenstolpe III p. 171. 
Motacilla melanope: Robinson & Kloss p. 73. 
Motacilla sulphurea: Miller p. 361. 
Q Pak Koh 1/3 1914. L=172 mm.; W = 72 mm.; T = 91 mm.; C = 12 — 
Bill: horn colour. Legs: flesh colour. sai ial te 
Fairly common during the cold season in the Northern Districts. 
