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 Anthomyiidae flew inside (= Eutrichota cf. lipsia)
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| John Carr |
Posted on 02-11-2010 18:06
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 Member Location: Posts: 9773 Joined: 22.10.10 |
Last November 1, Massachusetts, USA. Insects flew late last fall. Size 10 mm. I think it is female Anthomyiidae. More and larger pictures http://www.flickr...11/detail/ Edited by John Carr on 28-10-2013 14:58 |
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| javanerkelens |
Posted on 02-11-2010 18:27
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 Member Location: Posts: 2962 Joined: 18.10.07 |
Looks like Eutrichota... Do you have a sharp view on the arista and frontal vitta. Joke |
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| John Carr |
Posted on 02-11-2010 19:21
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Member Location: Posts: 9773 Joined: 22.10.10 |
I don't have the arista in focus but I have several nearly in focus views that convince me it doesn't have a large plume and probably none at all. Views of head with the back half of the front more or less in focus (from the set linked below the original picture): http://www.flickr...8/sizes/o/ http://www.flickr...7/sizes/o/ And a top view that didn't get the top in focus: http://www.flickr...172652211/ Is Eutrichota formerly part of Pegomya? Edited by John Carr on 02-11-2010 19:22 |
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| javanerkelens |
Posted on 02-11-2010 21:03
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Member Location: Posts: 2962 Joined: 18.10.07 |
Previous Eutrichota was called Pegomyza. Eutrichota has indeed resemblance with Pegomya but differs mainly on structure of male genitals and the long/pubescent arista (in some species almost bare) Eutrichota mostly is a very large fly and has long legs.. In this case the arista seems indeed only pubescent and it seems that the midtibia has no av seta....and with tarsomeres 3+4 distincly expanded..... With this combination, I would say Eutrichota frigida. (90%) Joke |
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| John Carr |
Posted on 03-08-2012 23:35
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Member Location: Posts: 9773 Joined: 22.10.10 |
I have acquired the relevant section of Flies of the Nearctic Region. According to Griffiths Eutrichota frigida has tarsomeres 2-4 slightly expanded. The local species with these tarsomeres twice as wide as the fifth, as in my fly, are E. lipsia and possibly E. tarsata, which differ in other details. Are there any pictures or drawings available of the fore leg of female E. frigida? |
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| javanerkelens |
Posted on 04-08-2012 14:54
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Member Location: Posts: 2962 Joined: 18.10.07 |
Unfortunally I don’t have the part about Eutrichota from Griffiths. (I will order them soom, but they are very expensive, so just save enough money to order all parts at ones) The tarsomeres in E. frigida are longer, comparing with the tarsomeres on your photo, who seems shorter. I can’t confirm if it is E. lipsia, but with a nice Nearctic key in hand…you could ID it on your one, without help. 
Edited by javanerkelens on 04-08-2012 14:55 |
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| John Carr |
Posted on 04-08-2012 15:07
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Member Location: Posts: 9773 Joined: 22.10.10 |
I'm also missing an important part of Griffiths -- the key to Eutrichota. The species descriptions are in number 4 but the key must be in number 5, which I don't have. The volume breaks are not at logical divisions. |
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| javanerkelens |
Posted on 04-08-2012 18:56
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Member Location: Posts: 2962 Joined: 18.10.07 |
What a shame....when I have number 5, I will send you a copy of the key! |
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| John Carr |
Posted on 28-10-2013 14:58
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Member Location: Posts: 9773 Joined: 22.10.10 |
I have Griffiths' key now, but I lack confidence interpreting the degree of dusting on the thorax. Michael Ackland has just identified a male specimen from nearby as Eutrichota lipsia and I suspect this female is the same, common species.
Edited by John Carr on 28-10-2013 14:59 |
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| javanerkelens |
Posted on 28-10-2013 20:14
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Member Location: Posts: 2962 Joined: 18.10.07 |
Nice ! Johanna |
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but don't see the image in the post.