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Most users ever online was 248 on Wed Dec 12, 2007 11:53 pm


ID advice please

 
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mfellowes



Joined: 07 Oct 2006
Posts: 3

PostPosted: Wed Oct 11, 2006 5:16 pm    Post subject: ID advice please Reply with quote

Hello everyone

There was a few of these feeding on ivy this weekend, along with S. ribesii, Er. pertinax, Ep. balteatus, M. scalare, and P. albimanus. This was in my garden, in west Surrey.

I thought that it was Syrphus vitripennis (hind femur colour), but a man in the know thinks that this is wrong and has gone away to think about it - your views would be appreciated.

Many thanks in advance.

Mark
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chlorophana



Joined: 16 Sep 2006
Posts: 24
Location: France

PostPosted: Wed Oct 11, 2006 7:14 pm    Post subject: Reply with quote

Hello Mark,
with vein R4+5 strongly dipped, broad shiny black abdomen with this yellow pattern, and black hind tarsus , it's a good pointer to Didea genus.
I'd say Didea intermedia, but I'm not completely sure.

French regards,
chlorophana.
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mfellowes



Joined: 07 Oct 2006
Posts: 3

PostPosted: Wed Oct 11, 2006 7:47 pm    Post subject: Reply with quote

Hello Chlorophana

Thanks for the tip - I appreciate it. My copy of Stubbs & Falk is in my office, so I'll have to wait until tomorrow to find more details, but there is a good picture of Didea fasciata on this web site, and I can see what you mean.

I've attached a lateral view (probably of the same individual) if that's any help...

Thanks again

Mark
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chlorophana



Joined: 16 Sep 2006
Posts: 24
Location: France

PostPosted: Thu Oct 12, 2006 7:16 pm    Post subject: Reply with quote

Mark, this photo help me, yes and no !
I would have said D. intermedia with these facial knob and mouth edge brownished (face not entirely yellow), but the picture shows a pale haltere knob, which is characteristic of D. fasciata. Unless it is due to flash?
So I'm not sure of all. Confused
We can even so excude D. alneti since tergite 5 have yellow spots.

So, it would be better to wait for some other opinions. Roger for example ?
Wink


Regards,
chlorophana.
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mfellowes



Joined: 07 Oct 2006
Posts: 3

PostPosted: Fri Oct 13, 2006 7:13 am    Post subject: Reply with quote

Hello again

I had a look at S & F and I then went for D. fasciata, based on haltere colour (I used a ring flash; but this was really a partial fill in, so I think that the haltere colour isn't an artifact of the lighting), but I'm happy to be put right.

Thanks again chlorophana - your advice was much appreciated.

Best wishes

Mark
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Roger K.A. Morris



Joined: 06 Nov 2005
Posts: 1583

PostPosted: Mon Oct 16, 2006 9:57 pm    Post subject: Didea sp. Reply with quote

This is definitely D. fasciata. D. intermedia is a relatively scarce beast and in Surrey is confined to the coniferised heathlands. D. fasciata is widespread and almost common in Surrey. I cannot see anything in the photo that would point to D. intermedia.

Data for this record would be appreciated by the recording scheme.

Roger Morris
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