266 LEPIDOPTERA. 



Underside of all the wings white ; all the spots and 

 blotches of the upper side repeated and rather enlarged in 

 pale smoky-grey, or pale purplish-grey, and all equally 

 distinct. Body orange-yellow, spotted with black , legs 

 purplish-grey. 



Variable in the extent of the smoky-grey cloudy spots, 

 which often are more or less massed together, and augmented 

 in size, that around the discal sjiot in particular being fre- 

 quently prolonged, sometimes to the base of the wing, and 

 also joined to the spots of the second line. Sometimes these 

 clouds are extended so that the white ground colour is wholly 

 superseded by|a semi-transparent dull lead-colour. This last 

 form seems to be most freqnent in Yorkshire, where also is 

 found a very^beautifiil variation in the opposite direction, 

 the smoky-gre}^ clouds and spots being in it almost absent, 

 or only in part indicated round the discal spot, so that these 

 are nearly white, with the exception of the tawny-brown 

 blotches. In some of our larger collections are specimens in 

 which these blotches also are more obscure, except the one 

 at the base of the fore wings, from this ranging through 

 every gradation to the normal colouring, and thence to the 

 form in which_the whole of the wings have become suffused 

 with semi-transparent silky-grey, or lead colour. In Mr. 

 Sydney Webb's collection is a strange specimen, having one 

 leaden-grey fore wing, the rest of the insect being of normal 

 colouring. Another in Mr. S. J. Capper's collection, has the 

 cilin leaden-grey, the remaining portions of the wings being 

 hardly darker than the typical form ; and another is wholly 

 smooth smoky-black. In the opposite direction, Mr. J. E. 

 Robson has taken, in Castle Eden Dene, Durham, a most 

 beautiful vlvite. specimen, having the usual round tawny- 

 brown blotches, but quite devoid of the smoky-grey clouds;, 

 and Mr. Capper has one in which the grey clouds of the second 

 line are replaced by short brown streaks, while a similar 

 series crosses the hind wings. An equally white one in Mr. 

 Webb's collection has a neat greyish ring around the discal 



