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Very dark-winged males, like this, are quite unusual but I usually see one or two per year :)
Thanks, Chris...it had me wondering for a while, but the general jizz is pretty distinctive, isn't it? There were a few Phasia obesa and pusilla around, as well, but too hard to photo on a very windy day.
Talking of pusilla, are they easy to separate from barbifrons? I saw a suggestion somewhere that it could be done on the colour of the halteres? One I took yesterday had very pale, yellowy halteres...does that make it likely to be barbifrons? It has hairs above the antennae, but I have only one other specimen to compare it with (that does have brown halteres). Thanks for any pointers.
Edit: Had another look and it does have hairs between the eye margin and the parafrontal bristles, as well as yellow halteres, so it is Phasia barbifrons...a new one for me.
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Lat/Lng: 53.8, -0.9
OS grid ref: SE7844