Sorry, I have rechecked using the key and the second last butt is a typical A athada male. I have also rechecked Ben Jin's specimen and concluded it is also A. athada male, abeit with an atypical postdiscal band. The real A. sublustris is a smaller but similar species.
I have also rechecked the last one and it still comes out as A. delta.
As for the first 2 pics of the same butt, it should be A. amphimuta since the outer 2 spots in space 7 & spot 6 are of equal size. There is some overlap between the two species and since A. major is much the commoner species in Singapore, there is always an element of doubt.
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