There are a number of Delias-mimics (including moths) in SE Asia, also strongly implying that Delias are toxic. Oddly, I can't think of any mimics in the Papuan region. Perhaps the unique and complicated patterns of Papuan Delias have never enabled mimicry to evolve, or, perhaps, there are some small mimic moths in the region with which I'm not familiar. The latter is certainly possible since I know next to nothing about most Geometridae, Arctiidae, etc. in that area.