40 RUDOLF SÖDERBERG, STUDIES OF THE BIRDS IN NORTH WEST AUSTRALIA. 
Ochthodromus veredus GouLD, 
Math. handl. n:r 155. 98, SF juv., Derby, Kimberley ?!/19 1910. 
Juvenal. — Both the birds are in typical juvenal plumage. The young male 
has a much darker brown back than that of the young female, and but little 
sandy buff edges on the feathers. Breast the same in both, being sandy rufous. 
The young male is also larger, the length of wing being 16 em., in the young female 
15 em. Both have the shaft of the first primary white, the female also has a 
little tint of white on the shaft of the second one. Lower wingcoverts smoky brown. 
Of course it is difficult to decide exactly on the basis of the above differences 
whether the young female belong to this species. I have compared it with juvenals 
at the Swedish Museum and found that the young female resembled most the young 
one of O. asiaticus. 
This resemblance is, however, rather dependent on the great likeness all these 
juvenals of the genus Ochthodromus show, a fact that has its special genetic interest. 
Both the birds were shot in the same flock in Oct. The time might correspond to 
the ordinary time of migration from the Malay Archipelago and Mongolia. 
Ecological. — After the first rains (the 20th of Nov. and later) I have seen 
flocks of this spec. in the neighbourhood of Mowla Downs, where it was general at 
that time. 
Aegialitis ruficapilla TEMm. 
Math. handl. n:r 157. 3 SS ad. Freemantle ?5/9 1910, moult.; 1 SJ ad. Beagle bay, Dampier land, 
fan VG TIN NEN ten fa Ne TND 
Variants. — Of. the moulting. The female has the band between the eye and 
the bill cinnamon rufous coloured and the centre and hind part of the neck light 
brown like the back. 
Moulting. — The specimens from Freemantle are all in moulting but none of 
those taken in July (Dampier land). The Freemantle specimens moult on breast and 
back. These specimens taken in Sept. are all characterized by a faded colour, and 
are consequently paler and have worn plumages. The new feathers, however, are 
not only darker but have all cinnamon rufous edges. In the July spec. these edges 
has either already been discoloured or reduced by wear. No real moulting of the 
edges has taken place here. The July specimens are also darker on the back than 
those of Sept. 
It is remarkable that the July specimens do not show any moulting. (Cf.following 
species.) Possibly there are a few pins in the cinnamon rufous round the neck. 
Moulting-season begins in Sept. 
Ecological. — This species was met with on the 25th of Sept. 1910 at Free- 
mantle. In July 1911 it was not uncommon at the white salt-water beaches, creeks, etc. 
in Beagle bay, Dampier land. Before, on the 28th of June, I saw it in small flocks. On 
