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This fly struck me as unusual in a number of ways; including the tapering abdomen, the rabbit-ear antennae, and the long thorax with its pebble black surface. No idea of the family, can someone help?

This fly was grooming and so holding its wings open many not be the usual posture.

Length, 4.4 mm. On squash plant. Grass and grass clippings nearby. Not far from woodland. West Virginia USA. Photographed on 22 September 2006.