Conopid fly -
Physocephala australianaID Michael Jefferies with thanks. We don't see these very often and I thought these flies were rather cute until I read a bit about them: Most conopids are found around flowers where they mate and lay their eggs directly onto the abdomens of Social insects such as ants, bees and wasps. "The larvae develop first by feeding on haemolymph (insect blood) and in their last instar stage, attack the tissue of the thorax, weakening and then killing the host. Pupation takes place in the abdomen. "More about these flies at
eol.org/data_objects/2052008