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Any ideas on this one. Taken Yesterday about 8mm bodylength, long hind legs. South coast UK- looks a bit like Sargus sp. ? but didn't seem to match anything in the gallery.

Brian V.

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Chorisops tibialis (Strat.)

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Beautiful stratiomyid. I assume that this is common in South as well. And this is the best season. :) Like Sargus... I didn?t see Sargus yet... :(

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Thanks for the ID Kahis and the comments Jorge :)
Brian V.

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looks more like Chorisops nagatomii Rozko?n? , 1979 to me, very frequent in south GB at moment.

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Well, I have never seen a Chorisops live, but according to Stubbs & Drake C. nagatomii should have bright yellow postpronotal (humeral) calli while C. tibialis should have at least partially dark ones. Perhaps they just aren't very well visible in the photo :|

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saw lots of Chorisops today and took several specimens all of which proved to be nagatomii (genitalia checked for the males). the colour characters need good light from the right direction to be sure about. one of todays specimens had entierly dark ppl although in rest it was half yellow. The green shine to the frons rather than black i find a good character when the two species compared, but again requires light from the right direction. In the field nagatomii is decidedly paler, both with a more yellow abdomen and a paler glossy green thorax. In southern GB nagatomii is a decidedly late summer/autumn species, tibialis much more frequent in mid-summer.

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which is the best typical habitat for these flies?? swamps? :S

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in GB both species frequent tall hedges, woodland edge and shrubby areas, one of the most reliable ways to find them is to sweep the foliage of sallow bushes but they can be found on any tree or shrub or bramble etc.

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Not sure if it helps but here is a shot from a lower angle.
Brian V.