30 THE GENERA AND SPECIES OF BRITISH BUTTERFLIES, 
varieties, especially of the female, in which the ground colour of the wings is nearly gray, or 
rather a brownish kind of slate colour, varied by a few marks nearly white. These specimens 
were thought to be the females of a distinct species, till a specimen was captured, in which the 
wings on one side were of the usual colour, while those on the other side were of the brownish 
slate colour above described. 
The insect has become more rare than formerly. It is, however, still pretty generally dis- 
tributed in the woods in the South. It has also been recently captured at Huddersfield, and in 
some plenty in the neighbourhoods of Scarborough and York. I saw this beautiful species for 
the first time on the Continent in the Forest of Fontainebleau, where, happening to be just in 
the season, I found it very abundant. The specimens then captured were precisely identical with 
specimens afterwards taken in England. 
