Genus— G ERYGONE. 
Gerygqne Gould, Grey’s Journ. Two Exped. Disc. 
Austr., Vol. II., App., p. 417 (note), 1841. Type 
(by subsequent designation, Gray, 1840, p. 22): P. albogularis Gould = 
P. olivaceus Gould. 
New name for Psilopus Gould preoccupied. 
Psilopus Gould, Synops. Birds Austr., pt. iv., pi. 61, 
April 1st, 1838. Type (by subsequent designa- 
tion, Gray, 1840, p. 22) ... ... ... ... P. albogularis Gould = 
P. olivaceus Gould. 
Noir— 
Psibpus Meigen, Syst, Beschr. Zweifl. Insekfc. Vol. IV., p. 35, 1824. 
Ostiarius Gistel, Naturg. des Thierr. fur hohere Schulen (pref. Easter 1847) 
1848, p. x. 
New name for Psibpus Oken= Gould. 
Small Gerygonine birds with small bills, medium wings, long tail and 
small legs and feet. 
Easily distinguished from the preceding genus by its larger size and 
longer, more slender bill. 
It seems that this genus has developed from the original stock in the 
opposite manner to most of the species, that is, in strengthening the original 
yellow under-coloration. In the genus Pseudogerygone a further develop- 
ment has taken place in the acquisition of a black fore-head and throat, but 
most of the species have lost the yellow under -surface, though showing it in 
the immature. 
Gould separated these little species under the above name, and then Sharpe 
subdivided the Gouldian genus into two, but his differential characters were 
such that most of the species would need redistribution and, moreover, fail 
to be accurately placed. I attempted a subdivision and hereafter rearrange 
the species, but without any conclusion as to finality. 
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