A number flying around the top of a couple of trees. There were also a few which I think were Macleay's Swallowtail, which often fought with the Jezabels, but would not perch to enable me to get a decent look at them.
In D. nigrina the red line around the hindwing underside is narrower, and the yellow band under forewing costal edge tapers more uniformly, as in this specimen, than it does in D. harpalyce