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Dear Sandy,

It is a Tachinid fly already, and a very beautiful one !
It is completely harmless (at least, to humans, not to caterpillars)
It looks indeed like member of the tribe Tachinini.

Maybe a difficult request, considering you are at the other side of the world, but,
if you could collect one and send it over to me, I could try identifying it.

My emailaddress reads th.zeegers@tref.nl


Theo