A Picture-winged Fly, Euxesta species, a little fly (4-5 mm long), that I have see a few times on rotting material, such as on a slime mold. This one was lapping up fluid from a rotting tomato, and it would pause intermittently to spread and wave its wings. Perhaps this is defensive mimicry, as it resembles a bee or wasp, to some extent. "Euxesta" means "well-polished", and I think that is a good name--these things are quite shiny.This may be Euxesta notata, but there are a number of species in the genus, and I do not have any information about the species-level identification.
This fly with stripy eyes is about 75ml long. Beautiful shiny metallic colours, with black and white front legs, yellow/gold other legs. It was picking up one front leg, waving it in the air, put it down and repeat with the other front leg, put it down and wave its haltere's. Then repeat the whole process."Physiphora aenea, which more recent references say is a synonym for Physiphora alceae, and Physiphora demandata, likewise said to be a synonym for Physiphora clausa" bugguide.net/node/view/33447 See information from Tony below. More photos of these here
This image is created by user Henk Soepenberg at waarneming.nl, a source of nature observations in the Netherlands.
Wikimedia Commons
Summary[edit] Description: Tetanops myopina couple, location: The Netherlands - Lemele - Lemelerberg. Date: 1 July 2013. Source: : This image is uploaded as image number 5028243 at waarneming.nl, a source of nature observations in the Netherlands.This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing for more information.. Author: : This image is created by user Henk Soepenberg at waarneming.nl, a source of nature observations in the Netherlands.. Camera location52° 27′ 18″ N, 6° 23′ 24″ EView all coordinates using: OpenStreetMap 52.455000; 6.390000.
Summary[edit] Description: English: Picture-winged Fly - Myrmecothea myrmecoides, Meadowwood Farm SRMA, Mason Neck, Virginia. As you can see, this is an ant mimic. I'm not sure what evolutionary advantage this is for the fly though. HFDF!. Date: 19 June 2013, 15:53:58. Source: https://www.flickr.com/photos/52450054@N04/9158258822/. Author: Judy Gallagher.