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THE GENERA AND SPECIES OF BRITISH BUTTERFLIES. 
marks more conspicuous, the black spots within them being very strong in the hind wings. 
The under side of the wings, which is similar in both sexes, is shown at No. 8. 
The Caterpillar is described as being green, with a row of angular dorsal markings of a 
paler tone, and a central line of brown. It is found both in April and June, the perfect insect 
appearing in June and August, this species being double-brooded. 
Some authors consider P. Salmacis and P. Artaxerxes as mere local varieties of the species 
under description. But in the collection of the British Museum they are still kept separate and 
distinct, and will therefore be described as distinct species in this volume. 
