300 LEPIDOPTERA. 



black and white ; cilia crenulated, grey, dusted with darker 

 and spotted with white. Hind wings white, clonded faintly 

 with grey toward the hind margin which is edged by a black 

 line ; nervures dusted with brown and black ; central spot 

 small, smoky-black ; cilia white. Antennae of the female 

 quite threadlike ; fore wings broader and dusted or shaded 

 with orange-yellow, not only at the inner edge of each stigma, 

 but also at the basal and first lines, and more bi'oadly along 

 the subterminal line ; hind wings dark smoky-grey, with 

 blacker nervui^es and marginal line, and white cilia. 



Underside pale silvery grey in the male, darker gi'ey in 

 the female ; costal region and nervures dusted with grey- 

 brown ; a dark smoky cloud in the discal cell ; cilia dusky 

 white. Hind wings white, faintly dusted with grey ; central 

 spot smoky black, followed by a very faint slender transverse 

 grey-black line, sometimes only visible on the nervures. 

 Body whitish-grey ; leg tufts white ; legs dark grey barred 

 with white, except the first pair in which the tibife are 

 blackish-brown barred with dull yellow. 



Usually only very slightly variable in the depth of colour 

 of the dark grey mottling and orange-yellow dots or shading; 

 Mr. Sydney Webb possesses a beautiful specimen in which 

 the latter is developed into strong orange lines and suffusion ; 

 and a dark female in which the orange dots are large and 

 conspicuous all along the transverse lines and around the 

 stigmata. One in Dr. Mason's collection, on the other hand 

 is much suffused with very dark grey, so that all the mark- 

 ings are obscured. Apparently by no means so variable here 

 as abroad, where many examples have the fore wings of a 

 very bright white with only the central bar darker ; or on 

 the other hand are very dark and much spotted with yellow ; 

 or wholly devoid of it. 



On the wing in August and September. 



Laeva cylindrical, elongate, rather flattened beneath ; 

 skin thin and semi-transparent ; head rounded and highly 



