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ID tentative at species, but the decorated arista (hair-like last segment of the antenna) must be diagnostic. Found in the wet spot where a stream crosses the trail. Several individuals were observed.

Tosohatchee Wildlife Management Area, Orange County, FL, December 2012.
Published in a Smithsonian blog about Bioblitz: www.e-torch.org/2013/04/puttin-on-the-blitz-the-bioblitz/

Malaise trap; Short tussocks, long tussocks, moss, lichen, Pilosella officinarum, exotic grasses

ID based on male hypopygium Fig. 37 in Bickel, D.J. 1991: Sciapodinae, Medeterinae (Insecta: Diptera) with a generic review of the Dolichopodidae. Fauna of New Zealand/ Ko te Aitanga Pepeke o Aotearoa 23.

ID is best guess ... the leg colours do not perfectly match the published description (ethanolic specimen)

Emerged from compost pile with deflated wings and pale pigmentation took about 50mins to inflate and dry its wings. Towards the end, green colour and dark bands on the abdomen were seen. It also took some time to expel some liquid form its abdomen.