---

Hi,
Some days ago I saw this nice Thereva, and with the key by van Veen (http://home.hccne...ml#Thereva) T. nobilitata was identified without much difficulty. However, I would like to ask why I had to start with "Femora largely or entirely black" - to me they show a light grey at best. Of course it is not the alternative T. aurata, but I have also seen brownish femora like in this case: http://www.dipter...to_id=3733. Perhaps it is just a matter of dusting, but there are, e.g., many green weevils that become dark when losing their scales, and nobody would a priori call them "black"...
Thanks for comments, Sundew