LITHOSID^. iqj 



squared, and so tliiu as to be much wrinkled ; costal and dorsal 

 margins very slightly curved, apex blunt, hind margin rounded, 

 hardly oblique ; dull pale brownish or drab, with a dark brown 

 spot at the end of the discal cell, a brown dot at the base, 

 faint indications of a first line shown by short brown dashes 

 on the nervures before the middle ; second line also a long 

 curved row of brown dots and dashes on the nervures beyond 

 the middle ; cilia drab, with a brown dot at the end of each 

 nervure. Hind wings long and broad, rounded behind, semi- 

 transparent, extremely thin and delicate ; whitish-drab, faintly 

 brown at the hind margin, with an indistinct pale brown 

 central lunule, and beyond it a straight transverse row of 

 faint brown dashes ; cilia whitish brown. Female similar, 

 except that the fore wings are slightly narrower and more 

 transparent. Underside yellowish-drab, with the nervures 

 brown, darker toward the hind margin ; costa of fore wings 

 yellower ; central spot visible ; and before the apex a dark 

 brown or blackish triangular cloud, or group of spots ; body 

 and legs pale brown. 



Hardly variable except towards the obliteration of the few 

 existing markings, specimens taken in the North of England 

 being extremely pale in colour and having only faint brown 

 dashes on a few of the nervures. 



July and August. 



Larva f inch long. Very stout, densely covered with 

 tufts of hair. Head shining black ; body waxy looking, deep 

 reddish grey, the hairs of two descriptions, the more numerous 

 stiff, pale brown with black points, slightly feathered, the 

 rest longer and black, densely feathered with soft pale brown 

 plumage. Legs glossy, tipped with black ; prolegs pale grey, 

 translucent. 



August to May, hybernating. On Lichen canimis and on 

 mosses such as Ily2^mim scriccum and Wcissia serrata. Prob- 

 ably on various lichens and mosses which grow upon the 

 ground in wet places. (Buckler.) 



