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- [2007-12-20 6:58]
Thanks for setting a bit of a puzzler! This, I am sure, is a female Lycaenid butterfly of the Miletine genus Miletus Hubner. My best estimate is that the species is ancon Doherty, for which Pinratana, "Butterflies in Thailand, Volume 4", lists two sub-species: ancon from North Burma to Thailand, and siamensis Godfrey, from Indo-China and Thailand. As this picture was taken in Uthai Thani, the most likely option is the nominotypical ancon.
This genus is one of the few carnivorous butterflies, the larvae feeding generally on Homoptera, and I have seen a female in Sulawesi laying eggs on their backs. This female is clearly upsetting the local ant colony. Both Miletus boisduvali and the related Allotinus apries are known to have ant associations in the early stages.
The picture holds a lot of interest for me from a biological point of view. Photographically, the composition is very good and the sharpness also. The lighting is predominantly from the rear, which makes the coloration not too clear and also results in the markings not being really clear for identification, but you have done very well to get even this. Best wishes