114 
RUDOLF SÖDERBERG, STUDIES OF THE BIRDS IN NORTH WEST AUSTRALIA. 
Explanation of plates. 
Plate 1. 
1—3. Discolouration (bleaching) phenomena by Falco lunulatus T.arH., fig. 1 9 ad. 5/1 1911: fig. 2 Q ad. 
3 Er Oj 1 KS rasa arna. IJIN 
4a. Young fully-moulted bird, SJ, of Lalage tricolor indistineta (MaArH.), a mixed outgrown plumage 
before the fully developed plumage is attained. 
. 4Db, 4c, 4d. Examples of changes of colours in the feathers of Lalage tricolor indistineta MATH. 
. 5. Young bird, S, of Malurus melanocephalus eruentatus Gourp., in moult.: gets the plumage of the 
adults without mixed feathers. 
6. A feather from the breast of Epthianura tricolor assimilis (MaArH.), showing peculiarities in the develop- 
ment of the colours by the moult. (dark spots in the white or vice versa). 
Plate 2. 
1—38. Variations in the ornamentation of the first primary in the adults and juvenals of Eurostopus argus 
HarTterRT, fig. 1, 2 juv.; fig. 25 O ads ofig: 3yig Ad. ute Av PR NN Uv RV uy 
fot ÖR OST SSA. 
g. Ja—9b. FPFeathers from the pectoral band of IHalcyon sanetus Wi6. & Hors, showing tlte development of 
the white by shedding the edging of the feather. 
11 a—l1b. Feathers from Calyptorhynchus macrorhynehus Gourp., showing knocking off and worn out 
phenomena in the moulting process. 
12a—12b. Feathers from the head of Dacelo cervina Gourp.; a new one with broad and barred edging, 
and an old one, worn and sharpened to a pencil at the point. 
13a—153b. New and old feathers from Podargus. In the latter the points of the side-rays are shed; 
the feather-point with its quill remains. The part that remains forms the protecting black streaks on 
the plumage. 
14. An old, worn feather from the head of Dacelo eervina GouLrp., showing the spots for a peculiar 
breaking off phenomenon. 
Plate 3. 
1—35. Types of Hieracidea orientalis ScHr. 
Plate 4. 
Trunk of a Dalebachia tree. Y. Laurell photo. 
Rocks at Sunday Island with fresh water-holes. Author's photo. 
Play-ground of Chlamydodera nuchalis JARD and SerBy. Authors photo. 
The same. 
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