200 LEPIDOPTERA. 



the South of England the prevailing ground colour is grey 

 with but a faint tinge of pinkish ; in Scotland it is decidedly 

 purplish, and this colour is intensified in examples from the 

 Scottish Isles ; but in Perthshire there is a tendency to slate 

 colour, with the stigmata more yellowish. In Sutherlandshire 

 and the Hebrides the stigmata are in some specimens quite 

 yellow or even orange. Such specimens are in Mr. W. H. B. 

 Fletcher's collection. In Ireland there is but little indication 

 of either the pinkish or purplish tint of ground colour, which 

 is pale grey, but with very strongly accentuated dark stripes. 

 In Mr, H. Goss's collection is a specimen from Sussex with 

 the broad central space very strikingly paler than ordinary. 

 Mr. S. Stevens has two in which the stigmata are absent. 

 On the wing in June and July. 



Larva soft, smooth, flattened, attenuated behind ; head 

 large, shining, much flattened ; on the second segment is a 

 narrow horny plate. Dull yellowish-green, dorsal line darker, 

 spiracular line whitish, interrupted ; head dull deep yellow 

 or yellowish-brown, mouth blackish ; undersurface, legs and 

 prolegs rather paler than the ground colour ; on the front 

 edge of the second segment are two black spots. Though 

 not shining, it has a semi-transparent appearance from the 

 thin texture of the skin. (C. Fenn.) 



July, August, and September, sometimes even in October, 

 on poplar and aspen, drawing together two leaves, uniting 

 them with silk, and living within in the daytime, but coming 

 out at night to feed. 



Pupa short, stout, much rounded and thickest in the 

 middle; anal extremity with a long pointed spike, bulbous at 

 the base. Red-brown, minutely punctured all over. In a 

 thin but strong silken cocoon of a brown colour, placed 

 between two spun-together leaves. The Rev. J. Hellins 

 says that the pupa3 of Scotch specimens are reddish-brown, 

 those from the South of England usually black. They 



