NOLID^. 189 



cilia ; body and legs white. Very constant in colour and 

 markings. 



On the wing in May and June. 



Larva rather flattened, not stout ; head rather small, anal 

 prolegs extended ; usual tubercular spots slightly raised and 

 furnished with tufts of short divergent bristles, and in each a 

 central long hair; those of the anal segment with several long 

 hairs. Head red-brown with three longitudinal streaks ; 

 dorsal region broadly yellowish tinged with red, and with 

 numerous black streaks placed longitudinally — two on the 

 second seginent, three each on the third and fourth, four each 

 on the following three ; upon the succeeding three segments 

 three red streaks each, three black streaks on the twelfth, and 

 a larger streak — long and forked — on the thirteenth. The 

 yellow surface is edged by irregular subdorsal blackish lines, 

 and the lateral surface below this is dull reddish ; hairs 

 yellowish brown, mixed with blackish. 



In July and August on oak, beech, blackthorn, and 

 probably other trees. By some authors said to feed on tree- 

 lichens. 



Pupa nearly cylindrical, slightly thickest at the shoulders, 

 blunt behind, rounded in front, with the head depressed ; 

 pale brown, darker on the back ; limbs well marked ; wing- 

 cases pointed ; last five segments fringed at the side with 

 delicate hairs (Fletcher). In a curious rounded cocoon 

 raised like a small projecting knob, thicker at one end than 

 the other, and exactly resembling the corner of bark or piece 

 of park-paling to which it is attached. 



In pupa through the winter. 



The moth sits in the daytime, head downwards, on the 

 trunks of trees, and usually on the edge of a projection of 

 bark, and would, from its white colour, be most conspicuous, 

 but that it so nearly resembles a small triangular blotch of 

 • bird's-dung on the bark. It doubtless flies at night, but is 

 rarely captured on the wing. 



