128 LEPIDOPTERA. 



Hind wings white at the base, shading to smoky brown ; cilia 

 white. Female similar, rather larger. 



Underside of the fore wings smoky brown ; costa dotted, 

 and hind margin shaded with white ; two white streaks lie 

 below the apex. Hind wings white, tipped with smoky 

 brown. 



On the wing at the end of May and in June, and some- 

 times a very partial second generation in August. 



Larva rather flattened, attenuated behind, segments 

 deeply divided ; yellowish white with slightly browner 

 dorsal vessel ; hairs very minute, only visible under a good 

 magnifier ; head black ; dorsal plate whitish with two large 

 triangular black spots along its posterior edge ; anal plate 

 dull white. 



September, on aspen, between united leaves, under a white 

 web, gnawing away the surface of the leaves. Through the 

 winter and till April, as a larva, in a chamber formed of a 

 turned-down corner of a leaf. 



Pupa yellow-brown ; in the same place. 



The moth when flying has a conspicuously milky-white 

 appeai'ance. It loves to hide in the daytime in the little 

 bushes of aspen which are plentiful in some of our more open 

 woods. Here it is easily disturbed, but only to fly to another 

 bush ; and at sunset begins to buzz quietly about them, so 

 that it is very easy to capture. It is not the least pretty of 

 this lovely genus. In the north it is said to frequent white 

 poplar, but this I have not observed, for I have never seen 

 it away from the woods and the little aspen bushes. Locally 

 common in Kent, Surrey, Sussex, Dorset, Somerset, Glouces- 

 tershire, Herefordshire, Herts, Essex, Suffolk, and Carabs ; 

 also found in Yorkshire ; and in Scotland in Perthshire, 

 Moray, Inverness, Ross-shire and Sutherlandshire ; but I 

 have no record for Wales or Ireland. Abroad its range is 

 through Central Europe, North and Central Italy, Scandi- 

 navia and Russia. 



