Order PASSERIFORMES. 
No. 67. 
Family SYLV11D2E. 
GEOBASILEUS HEDLEYI. 
DARK THORNBILL. 
Geobasileus HEDLEYI Mathews, Birds Austr., Vol. IX., pt. in., p. 479, pi. 453, Aug. 3rd, 1922; 
A. J. and A. G. Campbell, Emu, Vol. XXIII., pt. m., p. 220, Jan. 11th, 1924. 
Messes. A. J. and A. G. Campbell, who examined the type of Acanthiza 
winiamida Wilson, say that it is a sub-species of Acanthiza hedleyi Mathews, 
and not of Acanthiza iredalei Mathews. They also describe the nest and eggs. 
Nest. Covered, -with top-side entrance, slightly hooded; composed chiefly of weather-beaten 
grass stems mixed with a few spiders’ or insect cocoons, and warmly lined with small 
feathers. Upright diameter 41- inches (115 mm.); breadth about 3 inches (75 mm.). 
Situated near the ground in a banksia bush. 
Eggs. Clutch three; ovate in shape; texture of shell very fine; surface glossy, white, 
minutely freckled or “ dusted ” with light brick-red in the form of a zone round the apex. 
15'5 to 16 mm. by 11'5 mm. 
Breeding-season. [August] September. 
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