B OA RMID.-E—A SPILA TES. 39 



smaller, but with the body much thicker ; antennae simple ; 

 the wings whiter and less dusted ; the first and second 

 stripes of the fore wings drawn more closely together, and 

 all more distinctly defined. 



Underside of the fore wings pale smoky-brown, dusted 

 with white, the nervures defined in darker lines, and 

 beyond the middle an even, narrow, grey-brown, transverse 

 stripe ; hind wings much paler, white dusted with brown ; 

 nervures also visible, and the transverse stripe continued 

 across the wing and more curved. In the female all the 

 wings are white beneath. Body and legs mottled with white 

 and pale brown. 



Locally variable in the degree of brown dusting, which 

 in the South of England is rather dense, in some speci- 

 mens becoming very dark ; paler and of a more reddish- 

 brown tint in Ireland, or in some specimens almost white. 

 The Eev. W. F. Johnson has found in the north of that 

 country — on the heaths of the County Armagh — a race of 

 extremely small specimens, hardl}^ more than an inch in 

 expanse, and equally pale. In Delamere Forest, Cheshire, 

 is an intermediate race, very prettily marked with grey. 

 The female seems everywhere to be the more susceptible 

 of variation in the form and position of the transverse stripes, 

 the central one of the fore wings and the first of the hind 

 being sometimes clouded and much broadened ; or one or 

 more are absent, the possession of two stripes only on the fore 

 wings and one on the hind being by no means rare. Occa- 

 sionally the whole surface is sufiused with grey-brown or 

 umbreous, and one such, a male in the late Mr. F. Bond's 

 collection, has but very slight traces of the markings. In 

 a female in the same fine collection the first and central 

 lines coalesce. 



On the wing in June and July. 



Larva rather stout, swollen behind, slightly attenuated in 

 front ; incisions strongly marked, overlapping ; dorsal spots 



