TOUTRICINA. 185 



marking, however, prevails throughout. In some specimens 

 there is a pale or white blotch upon the dorsal margin ; in others 

 this blotch is the same as the ground-colour. 



The imago appears from June to August, frequenting Oaks 

 and other forest-trees. It occurs throughout the south and west 

 of England ; also in the midland counties, and in Norfolk. 



2. corticana, Schiff. Alls anticis griseis; cinereo, fusco brunneo, 

 virescenteve variis ; macula ad marginem dorsalem subbifida, litu- 

 raque anali albida ; costa griseo fuscoque punctata ; posticisfuscis. 

 cJ Exp. al. 6-8 lin. 



Head and face pale grey, the latter slightly darker. Eyes black. 

 Palpi : above dark grey, at the sides and beneath smoky-black, be- 

 tween iron-grey ; terminal joint pale grey. Antenna deep fuscous ; 

 basal joint clothed with grey scales. Thorax hoary-grey, the crest 

 grey. Patagia ; at the base tawny, the apex hoary- grey. Anterior 

 wings dull greyish-drab, with olive-green and black markings 

 speckled with white, and with a pale blotch on the dorsal margin. 

 The costa is umber-brown, marked with geminated streaks of drab- 

 colour more or less produced (the number of these streaks varies 

 from seven to nine), succeeded by the apical spot. In the middle of 

 the dorsal margin is a pale mark, in shape like a bird's head, with 

 the beak directed towards the apical margin ; nearer the base is a 

 similar- coloured, but smaller and rounded, mark ; the wing above and 

 beyond both of these markings is rich brown, streaked with umber or 

 black ; the apical region is clouded with brown, speckled with drab 

 and black. Apical scales greyish-drab, alternated with umber to- 

 wards the apex, with white tips and pale drab bases. Cilia dull, con- 

 sisting of a double row : the basal one dark grey ; the apical paler, 

 mixed with drab, and with white tips towards the anal angle, 

 bej^ond which they all become umber-coloured. Posterior wings 

 fuscous, paler at the base. Marginal scales fuscous, with paler 

 bases. Cilia grey, with a fuscous tinge. Abdomen dark, shining 

 grey, the caudal tuft drab. $ Exp. al. 6-8 lin. 



Very common, and although extremely variable it is more 

 constant than Pcec. profandana. The ground-colour ranges from 

 pale drab to smoky black, going also through the gradations of 

 olive and fuscous; frequently the ground-colour is green. The 

 markings are mostly umbreous, though not uncommonly rifle- 

 green, and black. 



The imago appears in June and July, and may be taken in 

 abundance off the trunks of Oaks. It occurs throughout the 

 country ; also in Scotland and in Ireland. 



The pupa is 3 lines in length, and of a reddish-brown colour. 



The larva feeds on the Oak and Whitethorn. 



