396 Mr. Butler's descriptions of Lepidoptera- 



broad dusky external border tapering to anal angle ; fringe greyish 

 white ; thorax and base of abdomen cinereous ; remainder of abdo- 

 men fuliginous-grey, with narrow white segmental bands ; under 

 surface sericeous-white, the wings irrorated with black-brown 

 scales, especially towards the costal margins ; a broad blackish 

 external border, fading to grey towards the externo-anal margins, 

 and with a whitish apical spot ; fringes grey, white at base ; legs 

 grey-speckled, the tibiae and tarsi almost entirely dark grey. 

 Expanse of wings, 28 mm. 



Peak Downs. 



This species bears but little external resemblance to 

 its allies. 



PLUSIID^. 



Westermannia, Huhn. 

 23. Westermannia argentata, n. s. 

 Primaries above silvery white ; secondaries pearly subhyaline, 

 the costal area with brassy reflections ; veins smoky grey ; external 

 border smoky grey, diffused, fringe dark grey ; thorax pure pearl- 

 white, collar bright orange in front; abdomen white, barred with 

 smoky grey ; primaries below dark smoky grey with golden 

 reflections ; costal border cream-coloured ; secondaries peai'l-white, 

 with a slender blackish marginal line ; fruage brownish at base ; 

 body below pearl-white ; tibiae cream-coloured ; anal segment of 

 venter whity brown. Expanse of wings, 33 mm. 



Peak Downs. 



This species has the general aspect, but not the 

 structure, of Metoponia. 



24. Westermannia concha, n. s. 

 Allied to W. superba, much smaller ; primaries silvery white 

 washed with bronze towards costa ; a narrower internal border, a 

 large rounded spot at centre of mterno-median area, and a broad 

 external border gradually narrowing to apex leaden grey, partly 

 edged and flecked with bronze-brown ; an indistinct narrow white 

 looped line, commencing on the costa before the middle, crossing 

 the cell, bounding the interno-median spot and part of the external 

 border as far as the upper radial, where it leaves it and retm-ns to 

 costa at apical fourth ; secondaries white, semitransparent, pearly 

 except towards costa, where there are brassy reflections ; veins and 

 a well-defnied external border tapering to a point at submedian 

 vein smoky brown ; fringe white ; body pearl-whitish, collar 



