220 Journal of the F.M.S. Museums. [Vov. XI, 
These specimens prove, that D. arcuata is also found 
in Sumatra and that its limit of distribution runs more to 
the west than supposed by Robinson and Kloss (I, p. 118). 
In the swamps round Palembang it is caught in large 
quantities and brought there to the market for consumption 
together with D. javanica. 
The two species are easily recognisable. Besides the 
difference in the upper tail coverts, pointed out by Robinson 
and Kloss, the following may be noted. 
D. javanica :—Orbital ring yellow, the brownish black 
on the top of the head does not descend the neck, no 
blackish marks on the under side. 
D. arcuata :—No yellow orbital ring, the black on 
the top of the head is much darker and runs down the neck 
to the mantle, the feathers on the upper side are bordered 
with ochraceous, whereas in D. javanica they are more 
grayish brown and far less marked. Breast and lower 
abdomen and a narrow median stripe, between with faint 
blackish spots. 
I once kept a number of D. arcuata together with a 
single D. javanica, all from Palembang ; the latter was 
never allowed to mix with the flock and ultimately eee of 
ill treatment by its fellow captives. 
48. Anas superciliosa (Gm.). 
R. & K., I, p. 118. 
3é6. Danau di Atas, Alahan Pandjang, Padang 
Highlands, 1530 M. (August). 
7é¢, 4°, 6 unsexed. Lake Korinchi, 733 M. 
(July). 
Iris brown upper mandible slate grey, tip black, lower 
mandible slate grey, tip and base black, feet greyish brown 
with a yellow tint. 
Wings, 6 232, 240, 242, 242, 243, 244, 246; 2 225, 
230, 235, 235, 237, 244, 250 ; unsexed specimens 230, 238, 
243, 244, 251, 256 mm. 
When I was in Korinchi in the month of July the ducks 
were present on the lake in very large flocks, some of them 
numbering up to fifty or sixty birds. Rowing round the 
border of the lake nearly in every creek one or more flocks 
were to be found. If driven away, they generally moved 
to the centre of the lake or else to some distant creek. 
A. superciliosa is also to be found on the Danau Bento, 
the big swamp in the north of Korinchi, and further in the 
Padang Highlands on the two lakes near Alahan Pandjang, 
the Danau di Atas and the Danau di Baruh. The natives 
in the last named locality told me, that the ducks used to 
