This little tachinine fly (7mm) is a very beautiful blue metallic colour, which suggests to me that it might belong to the genus Chrysotachina but I haven’t done any research yet so I could be wrong – it is certainly smaller than most Chrysotachina.
Recently I had a few chances to go back to the NHM in London and work with the world Diptera collections – it was marvellous! I took along some of my larger & more spectacular specimens from North & South America and tried to identify them (with varying levels of success!). I also took lots of photos of the parts of the collection I have been working in, for future reference. Here are just some of the better ones:
Many thanks to Erica McAlister & Nigel Wyatt for hosting my visits 
The specimens in this taxon group are all metallic tachinids and almost certainly comprise at least 2 taxa. The first is relatively undusted and looks most like Chrysotachina braueri while the other, dusted taxon, looks most like Chrysotachina ornata but I am not convinced that the genitalia match closely enough to be the same species.
