Agree with Homodes.
There are three species in Thailand: H. bracteigutta; H. perilitha & H. vivida (Moths of Thailand 3(2): 96-97), though none has the larva illustrated therein.
Please can you add this observation to the http://www.inaturalist.org/projects/moths-of-thailand project?
(you can sign in with your Facebook account, and add via http://www.inaturalist.org/observations/new?project_id=10474)
Congratulations Paul! This fantastic ant-mimic caterpillar is our Spotting of the Day!
"The adoption of ant-like characters by other organisms is known as as myrmecomorphy. Myrmecomorphs are mostly spiders but also comprise other groups of insects. Caterpillars in the moth genus Homodes are closely associated with weaver ants, and resemble them in morphology and behavior".
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