Diptera.info :: Identification queries :: Diptera (adults)
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 Lonchaea sylvatica ?
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| John Bratton |
Posted on 23-08-2017 13:00
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Member Location: Menai Bridge, North Wales, UK Posts: 642 Joined: 17.10.06 |
I thought the bulge in the leading edge of the wing might be characteristic. It is in alcohol.
John Bratton attached the following image:  [117.89Kb] Edited by John Bratton on 31-08-2017 13:23 |
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| John Bratton |
Posted on 23-08-2017 13:01
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Member Location: Menai Bridge, North Wales, UK Posts: 642 Joined: 17.10.06 |
Collected in my garden, Menai Bridge, Wales, 15 August 2017. John Bratton. John Bratton attached the following image:  [139.01Kb] |
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| John Carr |
Posted on 23-08-2017 14:47
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 Member Location: Massachusetts, USA Posts: 9922 Joined: 22.10.10 |
Lonchaeidae -- acalyptrate with bulging first section of costa, Tephritoidea-type oviscape, long ovipositor, and halteres black. |
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| John Bratton |
Posted on 23-08-2017 19:44
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Member Location: Menai Bridge, North Wales, UK Posts: 642 Joined: 17.10.06 |
Many thanks John |
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| John Bratton |
Posted on 31-08-2017 13:21
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Member Location: Menai Bridge, North Wales, UK Posts: 642 Joined: 17.10.06 |
Using the MacGowan & Rotheray RES Handbook, I think this is Lonchaea sylvatica. But there are a few things that don't fit. On p. 94 they say “the combination of all black tarsomeres and black squamal fringes make L. sylvatica unique amonst the British Lonchaea. This combination can, however, lead to confusion with certain species of Dasiops and as a precaution check for the absence of poststigmatical bristles and the lack of strong setae on the genae.” I looked at different angles and in different lights for the poststigmaticals, but wasn't tsure I was looking in the right place. My specimen does appear to have strong bristles on the genae. But the form of the ovipositor fits Lonchaea and not Dasiops, and the third antennal segment looks too long for Dasiops.
John Bratton attached the following image:  [82.37Kb] |
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| John Bratton |
Posted on 31-08-2017 13:21
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Member Location: Menai Bridge, North Wales, UK Posts: 642 Joined: 17.10.06 |
The other minor detail that doesn't fit L. sylvatica: the Handbook says the apical section of the ovipositor has strong black bristles above and below, whereas on this specimen the ventral ones are pale.
John Bratton attached the following image:  [55.88Kb] |
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| John Bratton |
Posted on 31-08-2017 13:22
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Member Location: Menai Bridge, North Wales, UK Posts: 642 Joined: 17.10.06 |
Ovipositor, dorsal.
John Bratton attached the following image:  [44.82Kb] |
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| Iain MacGowan |
Posted on 31-08-2017 14:48
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 Member Location: Perth, Scotland Posts: 442 Joined: 25.11.04 |
Hi John This looks like Lonchaea sylvatica to me. As the key states it is the only Lonchaea with black tarsomeres and black fringe to calypteres. No British Dasiops female has such long setae on the aculeus or such a long antennal flagellomere. The colour of the setae on the aculeus obviously varies a bit. Locating the post - stigmaticals of Dasiops can be difficult if you are not familiar with the genus The key to Lonchaeidae genera at http://lonchaeidae.myspecies.info/key-genera contains a link to a diagram which may be useful Iain Iain MacGowan |
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| John Bratton |
Posted on 31-08-2017 16:34
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Member Location: Menai Bridge, North Wales, UK Posts: 642 Joined: 17.10.06 |
Many thanks, John |
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but don't see the image in the post.
