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Asiomorpha coarctata
Millipedes belonging to the family Diplopoda and have two pairs of legs per segment. They are peaceful vegetarians and slow moving. If they are provoked, they may secrete poisonous liquid contain hydrogen cyanide. Source: http://kryp.smugmug.com/Diplopoda/Diplop...
Found on a plant box feeding on moss(?) it looks similar to Harpaphe haydeniana, a yellow-spotted millipede (http://www.answers.com/topic/harpaphe-ha...) except that this has orange spots.
I think the millipede was more interested in the dried moss than the ants. ^_^
The ants don't seem to be scared of the millipedes and looks like the millipedes are not interested in eating them either!