128 LEPIDOPTERA. 



arises its commou English name) ; on the costal margin are 

 five black spots ; the first and second originate a duplicate 

 angulated black first line, much obscured by the black 

 dusting; the third is attached to a black lunate discal spot; 

 the fourth originates the second line, which is slender and 

 usually obscure, and bends backwards and forwards in large 

 obtuse ill-formed angles ; and the fifth, which is large and 

 clouded, seems to edge the beginning of a faint slender white 

 subterminal line, which in its course is further bordered by 

 other black clouds, usually much smaller; extreme hind 

 margin ornamented with a regular series of black dots, or 

 spots, which extend out through the white cilia. Hind wings 

 small, rounded and crenulated behind ; white, especially so in 

 the costal area, faintly clouded beyond this with grey, and 

 dusted, or spotted, in moderation, with black; having often 

 two or three obscure partial transverse lines formed of aggre- 

 gations of this dusting or dotting, most distinct near the 

 dorsal margin ; of these the most noticeable runs into the 

 anal angle; central spot black; sometimes followed by a 

 sharply marked and angulated black transverse line; cilia 

 white, spotted between the crenulations with black. Female 

 usually larger, often considerably so ; antennae simple, black 

 spotted with white ; thorax and abdomen niuch more robust ; 

 wings more ample and often with the markings stronger. 



Underside of all the wings white, with the costal spots 

 distinctly reproduced, but the lines and dusting fainter ; on 

 the hind wings is a black spot on the front margin pointing 

 down toward a thin black central streak. Body greyish- 

 white, mottled with black; leg tufts brownish-grey; tarsi 

 black, barred with white. 



Variation in this species is great, and on different lines. 

 In the typical race or races it tends towards extinction of all 

 definite markings, leaving the whole white surface but 

 scantily dusted with black, most distinctly so toward the 

 margins ; — in Mr. F. J. Hanbury's collection is a specimen 

 almost white, the markings and dusting faint and nearly 



