42 RUDOLF SÖDERBERG, STUDIES OF THE BIRDS IN NORTH WEST AUSTRALIA. 
Variants. — One of the spec. J ad. of the 28th Dec. has black margins to 
the white feathers of the back part of the head. 
Moult. — All these specimens of Jan., Dec. and July are moulting, but in 
different ways. The spec. of Dec. and Jan. have wing-feathers and wing-coverts in 
strong moult, they are also moulting in other parts of (in one specimen all over) 
the body. The July spec. on the other hand is in very strong moult on the back 
of the neck, the back and the breast, but does not show any signs at all of moulting 
in the wings. 
Moulting-season. — The birds moult both in the summer (Dec., Jan.) and 
in the winter (July). Both these moultings are also found in Zgialitis melanops 
(cf. the preceding species). 
Kcological. — This species came to Mowla Downs after the first rains. I saw 
four birds on the löth of Dec. at a pool of water. At Nooncanbah (Fitzroy) it was 
also seen in Dec. (WIDELL). At Beagle bay I shot it in July. It was found there 
in flocks of 10—15, and was very shy. 
Numenius cyanopus VIELLE. 
Math. handl. n:r 164. J ad., Sunday Island ?2/2 1911, moult. 
The specimen in strong moult. 'The winter plumage seems to remain at least 
on the belly. It was shot in a migrating flock of birds, which lived on the sea- 
beach, when this one was exposed at ebb-tide. 
Glottis nebularius GuUNN. 
Math. handl. n:r 175. 2 IS ad., Beagle bay, Dampier land 7/7 1911; 2 SS ad., 1 89 ad., /+ 1911, ibid. 
Variants. — One spec. brighter than the others, but little irregularly freckled 
with brown, being more of a slaty greyish appearance on the upper part. 
Ecological. — This species was found in the first part of July in Beagle Bay, 
where it was straggling in flocks. All the birds shot were adults. 
Calidris arenaria LINN. 
Math. handl. n:r 178. 
Some specimens of this bird are to be found round Broome, where it is usually 
seen in the company of Little Stints (CRosSsMAN). In Australia during winter. 
Pisobia ruficollis PALL. 
Math. handl. n:r 179. 9 ad. Freemantle ?5/9 1910, moult. on the back; 2 SS ad., 1 L ad., Beagle bay, 
Dampier land ?4/7 1911, moult. on the back. 
