262 LEPIDOPTKRA. 



is a crest divided into small double tufts edged with black ; 

 fascicles short, greyish white ; abdomen dark grey or blackish 

 thinly covered with soft white downy hair-scales ; on the 

 basal segment is a broad depressed dorsal crest rather 

 obscured by long hair scales, and the following segments 

 exhibit slight dorsal tufts of dark raised scales ; lateral tufts 

 spreading, whitish ; anal tuft mixed grey and black. Fore 

 wings slightly narrower than in the preceding species, with 

 straight costa, blunt apex, oblique rounded hind margin, and 

 rounded dorsal margin ; colour blackish-grey, dusted with 

 minute white scales so as to appear of a dark slate-grey, and 

 having a white patch at the base of the dorsal margin ; first 

 line only visible as a series of blacker angulated streaks and 

 spots; second line a succession of black scallops or deep 

 crescents, edged inwardly with whitish ; orbicular and reni- 

 form stigmata indicated by black outlines; cilia chequered, 

 black and white. Hind wings white, with faintly brownish 

 nervures, and tinged with grey along the costal margin ; 

 hind margin edged with black, cilia white. 



Female darker, and with dark grey hind wings having 

 white cilia ; otherwise similar. 



Underside of fore wings in the male pale grey much dashed 

 with whitish between the nervures ; costa spotted with black 

 and one of the spots prolonged into a faint grey transverse 

 line ; cilia white, barred with black. Hind wings white, 

 clouded with grey along the costal region ; central spot, and 

 a spot near the costal margin, black ; hind margin edged 

 with grey, cilia white. In the female the fore wings beneath 

 are dark smoky-grey with the margins a little paler ; hind 

 wings paler smoky-grey with the spots faintly visible. Body 

 mottled, grey and blackish, legs dark grey, first pair black 

 with whitish bars. 



Apparently not variable with us, yet regarded abroad as a 

 permanent variety of a somewhat different Continental 

 mountain form. 



On the wing in April, May, and June. 



