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last picture on these flies

alike "floating" on a salt water puddle, in the street (South India, Kochi)


and the video ... of Genus Hecamede sp. mating

YouTube Video



I have no answer about the fact that if male specimen is so small Vs female, what is it doing on the shoulders ?
Is it there the "croisière" position ?
What's your opinion please,
merci beaucoup