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The Society for the study of flies (Diptera)

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#1 2010-08-10 21:27:29

afbainbridge
DF Members
Name: Anthony Bainbridge
From: Codford, Wiltshire
Registered: 2008-10-25
Posts: 39

A Picture-winged Fly

I'm stuck with the identification of this picture-winged fly - Tephritid, or Ulidiid, or whatever.   My trail leads to either Terellia or Urophora, but the wing pattern doesn't accurately match anything in the keys I've looked at.  The photo is a poor one, I'm afraid, but to give a bit more detail: ovipositor shining black; base of arista yellowish; jowls and face white, frons dark brown upper half, ochreous on lower half; legs yellow, with just the upper surface of the front femora darkened; front femora with four erect outward-pointing bristles on the apical third and a row of bristles only slightly less prominent on the upper surface; two prominent dorsocentrals; scutellum yellow, bearing two prominent basal bristles and two apical; one large notopleural just in front of the wing base.  Is that enough to be going on with?

Anthony Bainbridge


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Last edited by afbainbridge (2010-08-11 12:23:02)

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#2 2010-08-12 02:32:35

Richard Dickson
DF Members
Name: Richard Dickson
Registered: 2008-11-24
Posts: 322

Re: A Picture-winged Fly

Your picture and description match Urophora jaceana, or at least the specimens standing over that name in my collection. It is a common species and feeds on knapweed, Centaurea nigra. Strictly, examination of the aculeus is required to separated it from U.cuspidata and U.solstitialis. However the former of these is on greater knapweed, C.scabiosa, itself restricted to calcareous grasslands, and the latter is on musk thistle, Caruus nutans, and is local and rare. I've never found it.  So I think it is acceptable to label yours U.jaceana. My two female U.cuspidata, by the way, are considerably bigger than any of my U.jaceana.

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#3 2010-08-13 14:58:34

afbainbridge
DF Members
Name: Anthony Bainbridge
From: Codford, Wiltshire
Registered: 2008-10-25
Posts: 39

Re: A Picture-winged Fly

Many thanks.  However in all honesty I have to leave the matter open; I am not skilled in detailed examination, and this was found - I should have said earlier - on the calcareous grassland of Salisbury Plain, so might be U. cuspidata.  When I'm next at the same location I'll check the knapweed species.

Last edited by afbainbridge (2010-08-16 23:31:34)

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