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Cheilosia id conundrum

 
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conopid



Joined: 03 Sep 2005
Posts: 342
Location: Shrewsbury, Shropshire

PostPosted: Tue May 01, 2007 1:31 pm    Post subject: Cheilosia id conundrum Reply with quote

Question Hi,
I have three Cheilosia specimens, from three localities, that I just cannot key out or identify. They key out at the bergenstammi group, because they have very sparse hairs on the eyes, only really visible with a 20x microscope and dark background. Apart from this they would fit C pagana pretty well, so my first question is does C pagana ever have even the most sparse hairs on its eyes?

Second question does C bergenstammi ever have a noticeably longer than wide third antennal segment?

Third question - does C urbana ever exceed 8mm in size and does it have any spines on the ventral side of its hind femora (cf spines along the complete length in bergenstammi). My specimens appear to have spines along most or even all of the length.

As you can see these three specimens don't correlate entirely with any species.

Hope someone can help.

_________________
Nigel Jones
Shrewsbury
Shropshire
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