Posted by Mark-uk on 18-07-2018 18:32
#3
Try "Chandler & Negrobov (2008) The British species of
Xanthochlorus Loew, 1857 (Diptera, Dolichopodidae), with description of two new species. Dipterists Digest (Second Series) 15, 29-40."
Using that key I suspect you have
Xanthochlorus tenellus?