178 LEPIDOPTERA. 



hairy, black ; head, thorax and abdomen also black, the 

 latter tapering and ringed at the edge of each segment with 

 white. Fore wings narrowly trigonate, but all the margins 

 faintly curved ; apex augulated ; colour shining black, dusted 

 with golden brown ; first line indicated by an oblique white 

 streak on the dorsal margin ; second line a complete white 

 stripe, sinuous and angulated in the middle, usually of even 

 width; discal spot a white dot. Hind wings rounded 

 behind but with the apex rather elbowed, similarly black ; 

 having a white spot near the base and a complete angulated 

 white central stripe ; cilia of all the wings white or greyish- 

 -white. Female similar. 



Undersides of all the wings shining black with a purple 

 gloss ; all the markings as on the upper side, but of a clearer 

 white ; and in addition a large cloudy white spot on the 

 dorsal area of the fore wings near the base. Body and legs 

 black, shaded with silvery white. 



On the wing in May and .lune, but occasionally appearing 

 before the end of April ; another emergence takes place in 

 August. 



Larva. Head and second segment shining olive green, the 

 lobes of the head marked on the crown with black, and on 

 the face with fine black freckles; dorsal plate similarly 

 freckled ; body tapering from the third segment to the head, 

 and also on the two hinder segments ; beyond the thoracic 

 portion each segment is subdivided by a deep wrinkle across 

 the middle of the back, and by one each nearer the ends ; 

 the two middle portions, bearing the raised dots, very plump ; 

 general colour dull purple, with these dots black and furnished 

 each with a fine hair ; spiracles small, round and black ; legs 

 green ; prolegs translucent and almost colourless. (Adapted 

 from Mr. Buckler's description.) 



August, September and October on thyme and marjoram ; 

 and Mr. W. H. B. Fletcher has found it feeding in a web on 

 Asperula cynanchica. 



