INTRODUCTION. 
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146. Gerygone albogularis, Gould ' • • • Vol. II. PI. 97. 
Psilopus olivaceus, Gould in Proc. of Zool. Soc, Part V. p. 147, Young. 
147. Gerygone fusca, Gould Vol. II. PI. 98. 
148. Gerygone culicivorus, Gould Vol- I^- PI- 9^- 
149. Gerygone magnirostris, Gould Vol. II. PI. 100. 
160. Gerygone IseYigaster, Gould . Vol. II. PI. 101. 
151. Gerygone chloronotus, Gould . . . . . . ... . . Vol. II. PI. 102. 
Genus Smicrornis, Gould. 
Generic characters. 
Bill very small and short, swollen at the sides ; nostrils basal, oblong and protected by an operculum ; at the 
base of the bill a few fine hairs ; wings moderately long, first quill very short ; the first, third, fourth and fifth equal 
and the longest ; tail short and square ; tarsi moderate ; toes rather short, adapted for clinging ; the hinder and the 
middle toes equal in length. 
The members of this genus are the smallest birds of the Austrahan fauna. I have described two species, one 
inhabiting New South "Wales and the other Port Essington ; and had I characterized the bird of this form inhabiting 
"Western Austraha as distinct, I should most Ukely not have been in error, as it is probable that when the subject : 
has been more fully investigated it will prove to be so. 
152. Smicrornis brevirostris, Gould 
153. Smicrornis flavescens, Gould 
Vol. II. PI. 103., 
Vol. II. PI. 104. 
Family SYLVIAD^E, F?^: 
Subfamily SAXICOLINvE, Bonap. 
Genus Erythrodryas, Gould. 
Generic characters. 
As in Petroica, but with the hill shorter and more flattened at the base, where it is beset with a number of fine 
hairs which curve forward and overhang the nostrils ; wings shorter and more rounded ; first and second primaries 
much shorter than the rest ; the fifth the longest ; tarsi shorter ; toes more lengthened ; lateral toes nearly even ; claws 
much sharper and more curved. 
The members of the genus Erythrodryas are much more delicate in structure than the Petroicce, have their feeble 
bill strongly beset with bristles, and are more arboreal in their habits ; their usual places of resort being the 
innermost recesses of the forest, where, in a state of quiet seclusion, they flit about in search of insects ; the true 
Petro'icdB, on the other hand, frequent open plains, are more bold and vigorous, and possess a structure which adapts 
them for the ground over which they pass like the Saxicola. 
The two species of this genus, all that are at present known, are confined to the south-eastern portions of 
Australia and Van Diem en's Land. 
154. Erythrodryas rhodinogaster 
155. Erythrodryas rosea, Gould 
Vol. III. PI. 1. 
Vol. III. PI. 2. 
Genus Petroica, Swains. 
The birds I have retained in this genus might with propriety be divided by separating the pied Robins from 
the red-breasted species. The dusky Robin of Van Diemen's Land and the white eye-browed Robin of the 
north-east coast of Australia would also constitute another group of equal value with Erythrodryas, Drymodes and 
Eopsaltria. 
The red-breasted Petroicce are confined to the south-eastern portions of Austraha, Van Diemen's Land and 
Norfolk Island ; but I believe that the range of the pied birds extends to New Guinea. 
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