I was going by the images used in Moths of Victoria Part 6, Kallies et al (CD pages - note name change) The examples of A. (Trictena) atripalpis did not have the 2 white lines combining, while various examples of A. labyrinthicus did. I did not think I could see the antennae well enough to go by that.
OK, iNaturalist shows a wide variety of different white line combinations, joined and unjoined for this species. But most seem to show moew labrynthinine markings as apparent, but fainter here.