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@ ChrisR:

Thank you for your reply and ID! Judging by your words, Zelia seems to be a genuine headache genus. Host data shouldn't be a problem. I'm likely to have some males (needed for ID) and the genus is relatively small and with a key.

Yesterday I killed the fly in alcohol after it managed to get one wing damaged (top missing). This afternoon, I found another pupa, so I'm waiting for that one to hatch as well.

Could you tell by the photo's if the fly is a male or female? And where to look for the difference?

Best regards,

Scarabaeoid