52 LEI'IDOPTERA. 



top of head white; neck-ridge light brown; thorax very 

 slender, white, faintly tinged in front with yellow-brown ; 

 abdomen slender, white, slightly tinted with brown ; tufts 

 rather compressed. Fore wings somewhat narrow and 

 pointed ; costa gently arched ; apex angulated, almost 

 pointed ; hind margin a little curved ; dorsal margin nioi'e 

 slightly so, well ciliated; texture thin and very silky ; colour 

 white, costal margin faintly tinged with brown ; first and 

 second lines, and the intermediate central line, all oblique, 

 rather straight, and nearly parallel, greyish-white, followed 

 by a fourth equally obli(iue, but much less distinct ; and 

 indications of a similar cloudy line along the hiud margin ; 

 cilia rather long, silky-white. Kind wings moderately broad, 

 rounded behind, but anal angle almost squared, of the same 

 silky-white, with three indistinct transverse grey-white 

 stripes, undulating or faintly angulated ; cilia silky-white. 

 Female quite similar. 



Underside of the fore wings white, tinged toward the costa 

 with brown, and at the base thereof with smoky-black ; the 

 two transverse lines nearest the middle of the wing are 

 indicated, and there is a suggestion of a smoky-grey discal 

 spot. Hind wings white with a very slender greyish 

 transverse line beyond the middle. Body and legs brownish- 

 white. 



Not very variable, but s])ecinu'ns from Lancashire and 

 .South Yorkshire, and esjiecially those of the second genera- 

 tion, are often faintly tinged with ochreous, and their 

 markings are a little more detinite, some of them having also 

 a faint series of dark dots along the hind margin of the fore 

 wings; these were at one time supposed to constitute a 

 distinct species, and received the name of A. mancuniata, 

 but further investigation has not confirmed this view. There 

 is certainly no line of demarcation between the forms. 

 With this exception the only variation is in the greater or 

 less greyness of the lines. 



On the wing in June and July and in a partial second 



