34 THE GENERA AND SPECIES OF BRITISH BUTTERFLIES. 
The Chrysalis is dark brown, with one large metallic mark of a silvery colour, and several 
smaller specks of the same tone. The perfect insect appears early in June and again in August, 
but is very rare in England, though so common on the Continent as to possess no value in the 
eyes of ordinary collectors. I recollect taking several specimens in a few minutes while walking 
up one of the steep portions of the road over the Mount Cenis by the side of the Diligence, 
According to Mr. Stainton, the places in England most recently cited as localities in which it 
has been captured, are Exeter, Colchester, Shoreham, Harlston, Lavenham, Eastbourne, Dover, 
Bristol, and Peterborough. 
This beautiful insect should be sought in May or the beginning of June, and again in 
August. Its favourite haunts are at the borders of woods, on sunny banks, where if seen it may 
be easily captured, as it is so fond of basking in the sun when settled, that the collector may 
approach within a secure distance for the use of the net, without alarming it. Very few speci- 
mens of the Caterpillar have been taken in England, but perhaps they may be sought for with 
success if the proper season and proper situations be selected. 
