#1
This looks a lot like Syrphidae, but the DNA suggests it is some other family. Could the antenna be diagnostic?
Malaise trap, Townsville, Queensland.
#4
Yes, it's a syrphid and Paul is right about the genus.
This is a Ceriana sp., probably something like Ceriana ornata but there are some more candidates which I don't know that well.
Greetings