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Hello. I recently posted a photo on BugGuide.net of what has been narrowed down to being a Dancing Fly. It seemed we had narrowed it down even further to the Empis genus, however, after browsing here I am wondering if it may be a species of Hybos, such as Hybos femoratus. I don't have the photo here at work, but it can be viewed at http://bugguide.net/node/view/98297. I don't specialize in Diptera, so any help is much appreciated. Thanks.

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i think Hybotidae male.
Perhaps Hybos sp.

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I cannot be entirely certain but it might be Rhamphomyia, despite the Hybis-like appearance (the thickened hind femora). The discal cell is clearly emitting three veins (only two in Hybotinae) and the anal cell is closed by a strongly recurrent vein (more stongly so than in Hybotidae). Hence Rhamphomyia, because vein R4+5 is not forked.

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Thank you very much Paul. I did notice what you said about the anal cell. With the glare on the wings I wasn't sure if wing venation characteristics would be adequate. I really appreciate your help, and based on what you pointed out I feel safe with Rhamphomyia even though those swollen hind femurs had me scratching my head. ;) Your expertise is greatly appreciated. I'm going to move my image on the BugGuide site to the appropriate genus page. Would you like to comment on the image before I move it, notating what you told me here? Or I could quote what you stated here? Either way, thanks again for the help.
J.D. Roberts