60 RUDOLF SÖDERBERG, STUDIES OF THE BIRDS IN NORTH WEST AUSTRALIA. 
Variations. — Under side shows differences in the size and intensity of the 
spots. The specimen '/10 has the under side very spotted. The specimen ”!/s has the 
dark centres much more narrow, and on account of this the underside has got a con- 
spicuously white colour. 
Ecological. — Was found at Derby as well as inland. In Mowla Downs I 
have seen it gathered together in a flock of about ten, living in a low and close 
scrub. It was eagerly chased by the small birds. 
Order Psittaciformes. 
Fam. Loriideae. 
Trichoglossus rubritorques ViG. and HoRSF. 
Math. handl. n:r 303. 4 SS ad. Derby, Kimb. !2/,o0, ?!/10 1910; moult.; 4 SS ad. Meda, Kimb. ?/s5, 
Sy NON BYS ÖN 
Moulting. — The four moulting specimens do not show a decided moulting, 
this seems to be past. There are nevertheless pins among the neck and tail feathers, 
the red colour being caused by red pins; however, moulting of the edgings might 
also take place to some extent. 
Ecological. — This parrot lived in the bush, preferring those situated at creeks, 
where the vegetation was richer. Here it was in certain places very common (Meda) 
and appeared in flocks. At Mowla Downs and at Sunday Island I have not observed it. 
Fam. Cacatuidee. 
Calyptorhynchus macrorhynchus GouLp. 
Math. handl. n:r 316. 1 SJ ad., 2 29 ad. Nooncanbah, Fitzroy r. !9/12 1910, 17/; 1911, moult.; 2 SS 
ad., 3 2? ad. Hot Spring, wid. 15/3 1911, moult.; 2 dd ad. Lid JUV. 2 PIP fad Meda fkombö- by oe: 
!6/5 1911; J ad.? Meda (Sandy creek), Kimb. ??/5 1911; 2 ad. Beagle bay, Dampier 1. ??/5 1911. 
Plumage. — On "?/s (1911) a young male was shot, whose plumage resembles 
that of the female. In the tail-feathers a reddish tint is about to come out on the 
yellow stripes as in older or very old females. The females have grayish, yellow- 
white bills, the male grayish blue ones. The bill of the young male tends to the 
colour of that of the latter. Among the nine female specimens two have a plumage 
which approaches to that of the male adult. The one has a deep red border on the 
outermost tail-feather. The male plumage is more accentuated, because the specimen 
has no stripes on the lower part of the body. The bill is darker. The other specimen 
has only faint stripes and those only on the breast and has no red in the tail- 
feathers. Sometimes the stripes on the lower part of the body of the females shows 
