Diptera.info :: Identification queries :: Diptera (adults)
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 Muscoidea USA 2008-VIII-22 (= Eustalomyia)
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| John Carr |
Posted on 13-06-2011 00:24
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 Super Administrator Location: Colorado, USA Posts: 10652 Joined: 22.10.10 |
I got a possible ID as Fanniidae. My thought was Anthomyiidae. Western Massachusetts, USA, August 22 2008. Near water. It landed on my backpack, which must have had some pollen on it.  Larger size of above image available on Flickr. 
Edited by John Carr on 13-06-2011 12:15 |
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| Stephen R |
Posted on 13-06-2011 00:33
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 Member Location: Clitheroe Lancashire UK Posts: 2396 Joined: 12.06.09 |
I'm sure this isn't Fanniidae. I think your first thought was probably right. |
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| Stephane Lebrun |
Posted on 13-06-2011 10:41
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 Member Location: Le Havre, France Posts: 8248 Joined: 03.03.07 |
Eustalomyia sp.
Stephane. |
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| John Carr |
Posted on 07-07-2011 01:08
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Super Administrator Location: Colorado, USA Posts: 10652 Joined: 22.10.10 |
This should be Eustalomyia histrio (Zetterstedt) or E. festiva (Zetterstedt), the only two black-legged North American species. Can you tell which? According to the key in Huckett 1965 (Muscidae of Northern Canada...) festiva has preapical ad on hind tibia "longer and more robust than preapical pd" with the reverse for histrio. If I identify the bristles correctly they seem to be the same size. The other character is hairs of arista longer (festiva) or shorter (histrio) than basal diameter. I can't tell in the full size picture; they might be longer. I'm attaching another angle on the hind tibia. John Carr attached the following image:  [69.08Kb] |
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