LARENTID.-E—OPORABIA. 381 



Mora\' and West Ross, but apparently not found in the Isles. 

 Abroad it is common throughout Central and Northern 

 Europe, Northern Italy, the Ural Mountain district, and Tar- 

 tary, also in souie parts of North America, especially Nova 

 Scotia, Newfoundland, and Labrador. 



2. O. filigrammaria, //.-,s'. — E.xpanse I! to H inch. 

 Pore wings narrdw, \-ery glossy, silvery-white or pale silvery- 

 grey, witli three or four trausvei'se smoky-grey strijies, 

 blackened on the median uervure. Hind wings white, 

 banded with grey. 



Antennfc of the male simple l)ut faintly notched, thickly 

 ciliated, grey-brown, whiter toward the base, where also is a 

 tuft of white scales : palpi small, dark chocolate: face of the 

 same colour, convex and sinootheil downward ; head white, 

 rather roughened at the top ; thora.x shining, pale or dark 

 grey, with a minute crest at the back ; abdomen slender, 

 short, smooth, brownish-white. Fore wings long and rather 

 narrow ; co.^ta gently ai'ched thi-oughoiit ; ajiex bluntlv 

 rounded ; hind margin oblique, long and smoothly curved ; 

 dorsal margin a little full ; colour shining white, or pale 

 silvery-grey; basal line black, sharply angulated ; fir.st line 

 double, rippled and angulated, its duplicates set widely 

 apart, and enclosing a whiter stripe with some grey cloud- 

 ing ; second line apparently repi-esented by either of four 

 parallel rippled grey lines, or series of crescents separated by 

 white lines; hind-marginal region also ri])])led with grej- 

 stripes and divided In' a scalloped white subterminal lir.e ; 

 all the transverse lines blackened on the costa, and separated 

 there by whiter spaces ; discal S])ot a black dot : subdorsal 

 anel median uervures interruptedly streaked with black, the 

 rest similarly marked in a less degree ; and the angles of the 

 lines pointeil with the same; extreme hind margin edged 

 with black lunules; cilia shining grey-white dappled with 

 darkei-. Ilind wings long but ample, much rounded behind ; 

 silkv u'revish-white, with a curved transverse gi'evish Ijand 



