236 LEPIDOPTERA. 



subterminal line united into a complete stripe. But the most 

 notable must be admitted to be that one — of a creamy-white 

 ground tinged with grey, a large black-brown triangular 

 costal blotch, and the subterminal line sharply white, in a 

 brown area — in Mr. C. A. Dale's collection, which is believed 

 by him to be the type of Micro, Hdworthana, Westwood. 



On the wing from August to October and, after hyberna- 

 tion, in April and May. 



Larva cylindrical ; head rounded, light brown ; general 

 colour green, paler or darker, with a still darker cloudy dorsal 

 stripe and interrupted yellow spiracular lines ; the incisions 

 of the segments also yellowish, but wholly covered with long 

 white hairs, which are difficult to see except when held up to 

 the light. 



June, July, and the beginning of August, on oak and the 

 large-leaved sallow (Salic caprosa), feeding upon the leaves. 



Pupa cylindrical, bright green with a broad black line 

 down the middle of the back. Not more fully described. In 

 a white, somewhat boat-shaped, silken cocoon, upon an oak- 

 leaf, or between two leaves of oak. 



The moth prefers to sit during the day squeezed closely to 

 the surface of the bark of a trunk or branch of oak, especially 

 selecting those upon which lichens are growing. Its colour 

 blends with these, and this, with its marbled markings and the 

 roughness of its raised scales, renders it practically invisible, 

 or rather, indistinguishable, so that when its wings are lifted 

 by a puff of breath the discovery is almost startling. At dusk 

 and during the darkness of night it flies very quietly, and 

 visits any available sweets, such as heather-bloom, ivy-bloom, 

 blackberries when very ripe, yew-berries, and even sugar. 

 At light it is rarely taken, but this may arise from its close 

 seclusion among its favourite oaks. Probably to be found in 

 oak woods of any size in almost every part of the country, 

 but records are rather scanty. This may arise in part from 



