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Photo taken 6/29/2008 in Brooklyn, NY, USA. I'm wondering if this is a Coenosia sp. specifically C. humilis. Found a similar image at BugGuide here but not sure if it's identified correctly. Thanks in advance.

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Please, have another try at the attachment...

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Done. Sorry about that. Not sure but it looked like previewing undid the file selection.

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Yes Coenosia, but not C. humilis (which has a close-set pair of setae (av and ad) on the hind tibia, and mainly dark femora). I can't put a name to yours - it's a difficult genus which generally requires a specimen, and I'm no expert. Good luck!

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Near Neodexiopsis ovata??

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Thank you both.

John, I submitted this at BG here. Not sure if you think it should be placed in Neodexiopsis so I put it under Coenosiinae for now.

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I should have known not to mess with the New World! How do you separate Neodexiopsis from Coenosia?

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I don't know whether they are considered separate genera or subgenera these days. I consulted Huckett's revision from 1934. He says the typical appearance of Neodexiopsis has stripes on the thorax and spots on the abdomen, the latter similar to Ceonosia s. str. I'm not convinced either way by the bristles I see. A view of the hind leg from behind might clarify matters. A revision of the ovata group describes ovata as having darker antennae; this could be a relative.

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Thanks John!

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Manual of Central American Diptera considers them separate genera. They diverge in the key where you count bristles on the hind femur. Neodexiopsis has three preapical bristles on top (anterodorsal to posterior range). Coenosia has two.