I think i have to choose between Melanogaster hirtella and Lejogaster metallina. The densely haired thorax point to M. hirtella, but i have no info over L. metallina concerning this feature.
For one major thing, L. metallina has much larger, almost squairish, 3rd antennae. These in M. hirtella are small and round. Compare with this picture by Gerard in the gallery: http://www.dipter...oto_id=205.