Appearance
''P. chrysocephala'' measures 3.0–4.0 mm in length. It is variably coloured, but most often a dark metallic blue. Like all flea beetles it has large hind femora which it can use to jump. These are orange-red in colour with the hind femora darkened.It is differentiated from other members of the genus through a lack of anterior angles on its pronotum, the punctures on top of the head being as coarse as those on the elytra, and its first front tarsal segment being equal in length to its third.
Distribution
It is native to the Western Palaearctic, including Macaronesia, Cape Verde and North Africa and has been introduced into Canada.Habitat
''P. crysocephala'' can be found in various habitats, depending on the availability of a host plant. It is particularly associated with wild and cultivated members of the plant family Brassicaceae. It has been directly associated with ''Brassica napus'', ''B. nigra'' , ''B. oleracea'', ''B. rapa'', ''Nasturtium officinale'', ''Raphanus sativus'', ''Sinapis alba'', ''S. arvensis'', and ''Tropaeolum majus''.References:
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