Adi, kindly check if this is the same as your spotting:
Pentatomophaga latifascia (Villeneuve, 1932), a Tachinid fly, subfamily Phasiinae: http://blog.naver.com/PostView.nhn?blogId=dachori&logNo=130034495023&redirect=Dlog&widgetTypeCall=true
http://zsi.gov.in/checklist/Indian%20Tachinid%20flies.pdf
I too guessed it as Syrphids Lauren...
But waited for confirmation from friends like you(as i know very less about creatures)...Found some links of mating syrphids, though they differ from this..
http://www.flickr.com/photos/argent34/5795087478/
http://www.flickr.com/photos/edmcaskill/5954148637/
http://www.projectnoah.org/spottings/10835433
What do you suggest?
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