.... on golden rod
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I've a couple of these that I've just identified as genus. What characteristics say it's this species?
latest pics and diptera videos
On my part I am afraid it was ignorance. I used M Chinery's book for ID. Since your question I have checked online and by population abundance and coverage it seems most likely to G. jaculator or G. assectator, but I don't know what the distinction is between these two. Do you? Anyhow, sorry...... please feel free to reduce ID to genus if you can't tell from the photo.
on balance of probability likely to be this species, since it is by far the commonest species where the female has a long ovipositor (assectator has a short one).
Lat/Lng: 52.1, 0.0
OS grid ref: TL4152