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Hi,

I have checked out the Diptera Gallery and the closest I can come to for an Id of the attached fly is Tetanocera arrogans. The picture was take on 1st May 2006 in my Garden in Surrey, Southern England.

The fly was on Caltha palustris, on the edge of a small pond. and was approx 10mm in length but this is only an estimate as the size was not recorded at the time.

Is it possible to confirm that id from these pictures ? or is it something else entirely ?

Regards Chas

www.cgm-gardenlife.co.uk

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This second picture I believe is of the same type of fly, it was taken on the same day in the same position but a couple of hours later and shows a different aspect.


Regards Chas


www.cgm-gardenlife.co.uk

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Hi Chas.
My oppinion is:
1. Both images - Tetanocera, >90% of the same species.
2. Fly on first image has apical pd on f3 as in case of T. arrogans, but there are another species with pd on f3.
Nikita

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I'm pretty sure the first fly is T. fuscinervis. It has the typical subshining triangular area on frons - and no pd seta.

The second one is also a Tetanocera; it may or may not be the same species.

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Hi Nkita and Kahis,

Thanks both for your replies nice to see I was at least in the right area, I'm struggling a little with the terminology "apical pd on f3" .. I assume(guessing) pd is posterodorsal (I got that from the Glossary) so Im guessing we are looking for something like hairs somewhere but not sure where? and am I right with my guess that
"no pd seta" is the lack of hairs in the centre part of the thorax?

Thanks again your your assistance, in the meantime I hope you don't mind but I am about to post another similar fly for id assistance.

Regards Chas