---

Paul

How could you tell it was an Agromyzid from these images? I have gone back to the specimen and my key to British Families of Diptera (Unwin) and have noted:

a) post-verticals long and divergent
b) 3rd antennal segment rounded
c) sub-costa merges with Vein 1 (completely missed that one first time round, and it's actually the most obvious of the characters on such a small dark fly:()
d) lower orbitals incurved (damned hard to see the little blighters:o - and certainly not from the photo)

Without being able to see all 4 of these characters, how did you know?