LITHOSIDyE. 225 



rather glistening slate-grey, with a broad yellow stripe along 

 the costal margin to near the apex, but narrowing to a point 

 on the curve before the tip is reached ; cilia pale yellow. 

 Hind wings broad and ample, very thin in texture ; apex 

 blunt, hind margin rounded but slightly hollowed below the 

 apex ; very pale yellow, slightly deeper in colour at the 

 margins ; cilia glossy yellow. Female with simple antenna, 

 otherwise similar ; very slightly smaller and sometimes a shade 

 darker. Underside of the fore wings dai-k grey with the 

 costal margin and apex broadly deep yellow ; hind margin 

 very broadly pale yellow with grey nervures ; hind wings pale 

 yellow with the costa deeper yellow, sometimes edged with a 

 greyish cloud ; body dark grey ; legs yellow with dark grey 

 tarsi. Not variable. 



On the wing at the end of June and through July. 



Larva one inch long, rather uniform in thickness ; head 

 rounded, black ; second segment black at the back ; body 

 dull pui^Dlish, thickly covered with short purplish or brownish 

 hairs ; dorsal line black ; subdorsal line slender, blackish, the 

 usual raised spots also blackish ; from the fifth to the twelfth 

 segment is a broad lateral stripe, of a rich orange colour, 

 enclosing the spiracles and extending to the prolegs, the 

 spots and hairs on this portion being also of an orange colour ; 

 legs and prolegs purplish. When young the colour is more 

 bluish-black, or slate colour, with black raised spots and hairs, 

 and the lateral stripe and hairs yellow. (Buckler.) 



August to May or June. Said to feed on lichens on tree 

 trunks, but in confinement will eat leaves of oak, sallow, wild 

 apple, PJiamnus, Cornus, Clematis, and even low-growing 

 plants. Apparently the leaves of trees are its usual food. 



Pupa rather short and stout, rounded, blunt behind, 

 chestnut-brown, in a thin silken cocoon. 



The moth rests in the daytime amongst the leaves of trees, 

 whence it is easily beaten out, but usually falls to the ground 



VOL. II. P 



