Very good find, I was expecting a Chequered Swallowtail to show up in the Canberra & Southern Tablelands region and here it is. I'm in Braidwood and will be keeping a sharp eye out myself, although with little in flower at moment, they may not stop in time to get a photo.
So far we have a blue, a copper, the swallowtail, a white and a brown (nymph I think they are called these days). Plenty of blossom here but all a bit early really. The frost this morning might have wiped a few.