332 DESCRIPTIONS OF AUSTRALIAN MICRO-LEPIDOPTERA, 



white costal blotch, extending on costa from near base to middle, its 

 apex reaching more than half across wing, along costa mixed with 

 dark fuscous ; a semi-oval white blotch on inner margin about basal 

 third, and a smaller irregularly-triangular posteriorly ill-defined 

 white spot on the middle of inner margin, confluent on margin ; 

 sometimes three or four irregularly-placed very small dark fuscous 

 spots on disc, partially surrounded with white scales ; an irregular 

 somewhat pentagonal white blotch on costa at \ , its apex produced 

 as an irregular ill-defined white streak to anal angle ; a very small 

 ill-defined white apical spot ; cilia dark fuscous, with two white 

 transverse bars towards apex, a larger white spot at anal angle, 

 and three ill-defined whitish bars between these. Hindwings very 

 pale whitish-yellow, towards apex suffused with grey ; cilia very 

 pale whitish-yellow, with an indistinct grey line round apex. 



A very distinct and conspicuous species. 



Sydney and Hobart, from October to December ; rather common, 

 usually at rest on fences. 



21. Placocosma Meyr. 



Head smooth, sidetufts large, spreading, meeting behind. 

 Antennae in $ moderate, somewhat serrate, rather strongly ciliated 

 (1 J), basal joint rather stout, with strong pecten. Palpi moderate, 

 second joint not reaching base of antennas, somewhat dilated with 

 dense appressed scales, distinctly rough beneath, terminal joint as 

 long as second, moderate, recurved. Thorax with a dense posterior 

 crest. Forewings elongate, moderate, apex obtusely pointed, 

 hindmargin almost straight or slightly concave. Hindwings hardly 

 narrower than forewings, elongate-ovate, hindmargin rounded, 

 cilia f . Abdomen moderate. Posterior tibiaa clothed with long 

 dense hairs above. Forewings with vein 7 to apex, 2 from some- 

 what before angle. Hindwings normal. 



Structurally this genus very closely approaches Oenochroa, 

 differing in little but the absence of the rough dilation towards the 

 apex of the second joint of the palpi ; they are perhaps collateral 

 developments. Superficially there is little resemblance between 

 them, the species of Placocosma being handsomely marked with 

 large white blotches. 



