The caterpillar feeds on borage Borago officinalis (known as Fidloqqom in Maltese), and on bugloss (plants from the genus Echium e.g. Pale Bugloss Echium italicum which is known as Lsien il-Fart Abjad in Maltese).
There are a number of recognized subspecies, such as P. f. melitensis in Malta and P. f. borealis in Scotland.
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