21 
Northern Portion of the Malay Peninsula . 
This bird is marked male and is probably an immature 
bird of that sex. 
The sixths sexed male, is similar in every way to the pre¬ 
ceding; except that the black collar is less in evidence; the 
“ knuckle-dusters ” are well marked. Wing 13*2 inches. 
The seventh and eighth birds are sexed female. Wing 
13*2 and 12'2 inches; wing-speculum well defined. In one 
specimen the black collar is not very clear, but in the other 
it is broad and extends well on to the breast. Back of the 
neck in both specimens glossy greenish black. 
The evidence therefore tends to shew that the adult males 
are entirely black beneath and that the immature males 
are brown beneath with a black collar, but whether the fully 
adult females ever become quite black beneath or remain 
like the immature males is still uncertain. 
42. Dendrocycna javanica. 
Dendrocycna javanica (Horsf.); Salvad. tom. cit. p. 156. 
The Whistling Teal is common in Trang and on the 
Langkawis, and indeed in the north of the Peninsula generally, 
in swamps and rice-fields and on the larger rivers. 
Further south it is very much less common and is rarely 
met with in the Federated Malay States, except on the 
Perak and Pahang Rivers, where it is sometimes exceedingly 
numerous. In Pataui it was said to be a migratory bird, as 
is probably true of Asarcornis leucoptera , arriving with the 
breaking of the N.E. Monsoon in October and November; 
but its movements are probably only of a local character, 
depending rather on the relative suitability of the feeding- 
grounds in one district or another than on a true season 
migration. 
Falconid^:. 
43. Circus ^iruginosus. 
Circus eeruginosus (Linn.); Sharpe, Cat. Birds Brit. Mus„ 
i. p. 69 (1874). 
Langkawi, November and February. 
The Marsh-Harrier is fairly numerous in the winter 
