PVRA USTID.^—BOTyS. igj 



grey-brown ; abdomen slender, shining grey. Fore wint^s 

 rather widened, costa arched ; apex angiilated ; hind margin 

 moderately obhcjue, the anal angle well develojied ; colour 

 pale olive-grey or yellowish-grey, smooth and shining ; 

 markings faint — the first line upright but rather curved ; 

 second rippled and strongly bowed outwardly, both dark 

 grey and the latter edged with paler — a spot in the discal cell 

 is just perceptibly darker ; cilia concolorous, very glossy. 

 Hind wings whitish-grey or pale olive-grey with an obscure 

 cnrved narrow white transverse stripe in the middle, and 

 another along the hind margin ; cilia grey-white, intersected 

 by a grey line. Female similar. 



Underside shining pale smoky grey, the fore wings with a 

 faiut discal spot, the hind with an obscure whitish transverse 

 stripe. Body and legs glossy grey. 



There is some variation in the ground colour from smoky- 

 grey to yellowish-fuscous, and this seems to be in some degree 

 local ; specimens from the fen districts often showing a 

 strong tendency in the latter direction, while those from the 

 North-west of Scotland have a decidedly smoky tint. 



On the wing in the latter i^art of May and in June; but in 

 Scotland in July. 



Larva but little more than half an inch long, very slightly 

 tapering at each end ; segments well defined, each having a 

 subdividing wrinkle across the back; head rather small, 

 rounded, the lobes well developed, glossy blackish-brown • 

 dorsal plate similar, divided by a fine pale line, the margin 

 next the head remarkably pale ; colour of the back and sides 

 dark grej'-brown, darkest in front ; spiracular region and 

 undersurface pale ochreous-drab ; dorsal line darker and 

 warmer brown than the back ; segmental folds ochreous- 

 drab ; raised dots shining blackish-brown, on the thirteenth 

 segment united into a large spot; anal plate brown, 

 minutely freckled with black-brown ; spiracles small, round, 

 black ; the raised dots beneath them brown, each bearincr a 



