324 LEPIDOPTERA. 



oblique and curved, returning toward the costa ; between 

 them is a black cloudy spot containing two blacker dots, and 

 representing the reniform stigma ; often this throws off a 

 faint smoky streak to the first line. Where these lines are 

 visible there is usually darker dull purplish-brown clouding 

 towards the hind margin ; cilia concolorous. Hind wings 

 rather long, with the hind margin sinuous ; white or smoky- 

 white with an abundant dusting of purplish-brown, and a 

 general superficial purplish gloss ; nervures tinged with 

 brown ; cilia white. Female often almost devoid of the 

 darker clouding of the fore wings, which are therefore 

 yellower, but even with this brighter colour there is often a 

 narrow purplish-brown shade along the hind, margin ; hind 

 wings whiter ; body short but hardly thicker. 



Underside of the fore wings purplish-brown ; costal and 

 apical regions fulvous-yellow ; reniform stigma indicated by 

 a black cloud. Hind wings yellowish-white ; beyond the 

 middle is an indistinct, partial, dusted, tawny transverse 

 streak. Body and legs yellow-brown. 



Such variation as exists in this species is in the direction 

 already indicated — the presence or absence of transverse lines. 

 and of the dark shading — and these are not wholly sexual, 

 since males are not infrequently quite yellow so far as the 

 fore wings are concerned ; and occasionally a female is found 

 having the transverse lines and the dark shading very dis- 

 tinctly visible. Colonel Partridge has an example taken near 

 Enniskillen, Ireland, in which the yellow colour is wholly 

 obscured by smoky clouding. 



On the wing from the end of June till August. 



Larva cylindrical, of moderate stoutness, the three hinder 

 segments slightly tapering, and the anal prolegs extended 

 backwards ; head rounded, greenish-drab, with dusky dots and 

 hairs ; body rather velvety, bright green, the colour deepest 

 on the back and down to the spiracles, the tracheae showing 

 faintly through the skin as a paler thread ; subdorsal stripes 



