I used to live in Darwin and would attract mozzies and midgy flies from 100km away!
Tea tree, eucalyptus, calamine (although it is no where near as good as it used to be!)
and I found a guy who sold magic spray we called it, 'stop the itch' I think it is called (I will look tonight) he was from NSW I think, and would sell it at the markets in Darwin, you can order it online. It is the best stuff I have ever used and highly recommend it.

I will post details tonight.