Thank you SK for the comment, but I am not an 'expert' ( I don't like that word). There is much I don't know and have to ask other Delias fanatics.
Anyway, re D.h.hyparete. My initial thoughts. Anything is possible, but in this case I doubt it. The nearest D. h. hyparete gets to Singapore is, I think, W. Java (I haven't got my maps with me). It is not found on Sumatra, which would be the natural stepping stone for any expansion of that ssp.
This is most likely either a misidentification, a deliberate introduction or an accidental one. I can accept the first, but if it is either of the latter two then it is regrettable, from the purity of ssp. point of view. From my observations on Koh Samui, where I think I have found both D.h. metarete and D. h. indica, I believe that the subspecies can interbreed where they meet and produce intermediate forms. If this is the case, I will have much work to do to see if these intermediates are fertile or not.
My feeling is, don't go out with the intention to finding D. h. hyparete, you may have a VERY long wait.
Could someone tell me what NSS is. I need to see the paper in which this observation was published.
