 Its brassy colour , smaller size , and more finely and closely punctate @-@ striate elytra distinguish it from its ally , P. chrysocephala , which is also found on Lundy . P. luridipennis is sometimes called the " bronze Lundy cabbage flea beetle " to differentiate it from another beetle found on the Lundy cabbage . This latter beetle , the " blue Lundy cabbage flea beetle " , is a short @-@ winged form of the widespread P. napi . 
