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First I thought this was a Lucilia caesar, but right now I'm not sure if it is a Lucilia caesar or a Lucilia sericata. Can someone help me out and perhaps tell me how to see the difference?

Taken in July 2013, The Netherlands.

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With this picture one can say that it is not L. caesar, the frons is too broad and the basicosta is pale cream. There is either Lucilia sericata or Luclia regalis.

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Thanks for the answer!