Author 'Flo' (Id 179434 ) : Hello to all!
I looking on the Internet and I think finally having found the name of this small insect that flies the forget-me-not: Empis opaca , fly family Empididae - predator flies, midges and mosquitoes.
If a specialist through to me confirm...
I found this information on a very nice site: au petit Bonheur Minouche virtual garden! You are going to see, it is very interesting.