352 LEPIDOPTERA. 



but apparently not further north. In Wales I have found it in 

 woods in Pembrokeshire, but rarely ; and in Ireland it seems 

 only to be recorded from the county of Cork. Abroad it is 

 distributed through Central Europe, the North of Spain, 

 Sardinia, Central and North Italy, Scandinavia, and 

 Armenia. 



2. P. corticana, SrMfi. — Expanse | inch (IG mm.). 

 Fore wings not broad, olive-brown or brownish green, 

 usually with a sharp, irregularly-shaped white dorsal blotch. 



Antennae olive-brown ; palpi, head, and thorax dark olive- 

 brown ; abdomen grey-brown. Fore wings not broad ; costa 

 gently arched, apex bluntly angulated, hind margin gently 

 curved ; dull olive-green, dotted and clouded with black or 

 grey, costa regularly dotted with black ; in the middle of 

 the dorsal margin is an oblique curved ]ialer, or white, 

 blotch edged with black or dark green, apex mottled with 

 the same ; cilia olive-green. Hind wings, with their cilia 

 smoky brown. Female similar. 



Undei'side of the fore wings smoky brown ; costa dotted 

 with white. Hind wings smoky white. 



Both sexes variable in every shade between pale brownish 

 green, pale grey, and deep black ; also having the dorsal 

 blotch very often pure white. 



On the wing through July and August. 



Larva cylindrical, rather sluggish ; dull pale yellowish 

 brown, or bone colour; rather darker towards the head, and 

 having a conspicuous square reddish brown internal blotch 

 in the ninth segment ; raised dots small, black ; hairs rather 

 long ; head light shining brown ; plates bone-colour ; feet 

 black. 



May and June, upon oak, usually in a rolled leaf, but often 

 also in the fresh soft oak-apple galls (galls of Cynips tcr- 

 minalis) and also in the currant-shaped galls of the oak- 

 catkin (galls of CyniiK qucrcuh-pcduncuU), feeding upon the 



