THE BIRDS OF AUSTRALIA. 
Adult male. General colour above pale earth-brown including the head, back, upper 
tail-coverts and wings, with a slight yellowish tinge on the back and outer aspect 
of the flight-quills ; inner webs of the last hair-brown with white margins ; tail 
dark brown, white at the base and more or less white at the tips of the feathers ; 
lores white at the base ; throat and entire under-surface silky-white including the 
under tail-coverts, axillaries and under wing-coverts with a slight tinge of buff on the 
breast ; quills below hair-brown with white margins ; lower aspect of tail similar 
to its upper surface. Bill black, base of lower mandible brown ; eyes dull red ; 
feet black. Total length 96 mm. ; culmen 8, wing 51.5, tail 36, tarsus 19. Collected 
at Mungi Rock Hole, eight miles S.E. of Mount Alexander, West Kimberley, North- 
west Australia, on the 19th of June, 1911. And is the type of Gerygone Icevigaster 
mungi Mathews. 
Nest and Eggs. Not described. 
Masters’s description of his new species G. simplex reads : “ All the upper- 
surface, and ear coverts, light brown ; lores, and a spot behind the eye, blackish- 
brown ; a line from the nostrils over the eye, a spot beneath the eye, throat, 
centre of abdomen, and under tail-coverts white ; sides of the chest light grey ; 
remainder of the under-surface of a very light buffy- white ; primaries and 
secondaries dark or blackish-brown, margined with light grey ; tail above, 
for two-thirds of its distance from the base, black, the two central feathers 
dark brown ; the outer feathers with a part of the external, and a large patch 
not quite reaching the extreme tip of the internal webs, white ; the remainder 
of the tail-feathers with a patch of white on their inner webs, this patch 
gradually diminishing in size towards the two central ones ; beneath the tail 
the black becomes much paler, and is crossed by four or five transverse 
wavy fasciae; bill and feet black. Total length, 3.9; wing, 2.1; tail, 1.6; 
tarsi, 0.65 ; bill from fore-head, 0.5 ; from gape, 0.55. 
“ One male and one female, Gulf of Carpentaria. From Mr. Broadbent. 
The species can be readily distinguished from G. magnirostris (its nearest 
ally) by the white line from the nostrils over the eye, by the large white 
patches in the tail, and by the under mandible being jet-black, and not pearl- 
white at the base. The sexes are alike in plumage.” 
Sharpe conjectured : “ From the description given by Mr. Masters, I consider 
his G. simplex to be the same as G. Icevigaster. Should it eventually be distin- 
guished from the latter species, it cannot bear the name of simplex , already 
appropriated by Cabanis, and I would propose Pseudogerygone master si for it.” 
Ramsay stated at once that it was a valid species, but gave no further 
details. 
I have a specimen collected at Nor man ton, the type locality, by Mr. Kendal 
Broadbent, the original collector : it has been identified by Broadbent from 
the original specimen, so that it should represent the species. This specimen 
I have figured, but it does not agree with the description in the tail coloration, 
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