a6o LEPIDOPTERA. 



elongated, the hind margin very sinuous ; pale smoky-brown 

 crossed by an exceedingly faint darker line ; cilia pearly 

 white clouded with smoky brown, and having a dark line 

 along the base. Female similar. 



Underside of the fore wings pale yellow with extensive smoky 

 clouding in the middle ; second line and cilia as on the upper 

 side. Hind wings also as above. Body and legs dusky yellow. 



Usually not variable, except that specimens of the second 

 brood are more dull in colour. 



On the wing in May and June ; and as a partial second 

 generation, at the end of July and in August. 



Larva three-fourths of an inch in length, slender, head 

 rather flat and as wide as the second segment ; the body 

 thickest from the seventh to ninth segments, thence taper- 

 ing to both head and tail; anal prolegs stretched out 

 behind : the skin very glossy and glistening, though some- 

 what wrinkled : colour of the head pale orange-brown ; the 

 antennal jiapillas paler still and tipped with black ; the mouth 

 brown ; the ocelli black, and a black spot some distance 

 behind them on the side of the head ; the back to the 

 spiracular region is of a rather brownish olive-green; 

 the dorsal line darker olive-green ; an undulating row of 

 internal darker blotches runs along, in an interrupted 

 manner, a little above the spiracles, showing plainly through 

 the translucent skin ; spiracles very small and inconspicuous, 

 ringed with brown ; below them the rest of the side and the 

 undersurface and legs are of a uniform tint of very pale 

 watery olive-green. (Rev. J. Hellins.) 



End of June and in July on hom-beam (Carpinus betulus), 

 feeding on the leaves, hiding at first on their undersides 

 under the protection of a few threads of silk ; afterwards 

 joining two leaves together. In all probability a second 

 generation feeds in late autumn, but on this point information 

 is wanting. 



Abroad it is said to feed also on oak, beech, and hazle. 



