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Smallish black muscid. Lightly dusted on tergites which all have a row of recumbent marginal bristles. One long pd and 3 small av on hind tibia. No bristles on front tibia. Sternopleurals 1:1. Head with deeply recessed ptinial suture. Lunule appears whitish with hairs at certain angles, and frons is prominent just above it. Frontal orbits shining black, contimnuing down facial orbits until heavily dusted from just below base of 3rd antennal segment. Antennae minutely pubescent. Eyes bare, plapus black. Two upper orbital bristles pointing outwards, one lower bristle forwards. Apical scutellar bristles converging to just touching. Full rows of rather weak dc’s and acrostichals.
Blackish halteres. See pictures below

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2

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2

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3

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Where? When? How small, 4-5 mm?
My guess is Hydrotaea armipes.
In this case t3 should be also with 1 ad and eyes should be shortly hairy (see against black background)

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I do not think that it is Hydrotaea armipes. I can see 1ad on mid tibia (H. armipes does not have ad), frontal triangle and parafacials shining black and triangle reaching only middle of frons. Thus, I think H. pilipes.

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Thank you Nikita and Andrzej, I had not thought that Hydrotaea could be so shiny. I have checked the details through my key and pilipes fits. (1 short ad in apical 1/2 of mid tibia; frons at vertex wider than eye; 4 fine bristles ventrally at base of mid femur). This was taken on 1/7/12 at gravel pits near Lincoln UK and appears to be an uncommon species here.
Regards
Phil Porter