B OA RMID. E— O URA P TER YX. 34 1 



near the anal angle, and to white along the front margin. 

 Female larger, abdomen stouter, otherwise accurately 

 similar. 



Underside of the fore wings pale primrose-yellow, except 

 the dorsal region, which is broadly silky white ; perpendicular 

 lines of the upper side faintly perceptible. Hind wings 

 yellowish -white; nervures rather thickened and very visible. 

 Body and legs nearly white. 



Usually constant in colour and markings, but there is in 

 Mr. Sydney Webb's collection a specimen in which the first 

 line is removed to the middle of the fore wings, and the 

 second line is so placed immediately beyond it that the cloud- 

 ing of the two coalesces, and forms a narrow perpendicular 

 yellow-olive band. Mr. Percy Bright has one similar, and 

 having the usual stripe upon the hind wings drawn back 

 nearly to the base. Specimens occur, very rarely, in which 

 the two lines of the fore wings are placed extremely widely 

 apart ; and others in which the tips of the fore wings 

 are quite falcate, or in which the hind margin is rather 

 expanded. 



On the wing at the end of June and in July, but in the 

 South of Scotland extending into August. Occasionally, 

 though rarely, individuals of an extremely partial second 

 generation are met with, near London, in September or 

 October. I have myself taken it in the latter month. 



Larva very long and slender ; fourth segment swollen ; 

 seventh with lateral bud-like protuberances ; ninth and 

 twelfth slightly humped, the former especially ; two parallel 

 points project from the anal segment ; sides puckered, head 

 very flat, almost squared in front ; dull purplish-brown ; 

 legs much curved and sprawling outwards ; general colour 

 yellowish-brown, reddish-brown, clay-brown, or putty-colour, 

 often shaded and marbled with dull purple, particularly upon 

 the protuberances ; undersurface with numerous longitudinal 

 whitish lines and grey indistinct hairs. (C. Fenn.) 



