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The Society for the study of flies (Diptera)

Affiliated to the British Entomological and Natural History Society (BENHS)

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#1 2017-06-17 19:52:49

IanCarle
DF Members
Name: Ian Carle
From: Herts
Registered: 2016-07-28
Posts: 58

Geomyza majuscula or tripinctata?

Hi folks, saw this fly at Panshanger Park - Lodge Meadow today TL282129, I've had a go at keying it out using British Journal of Entomology And Natural History 1993 6:159-176, A review of the British Opomyzidae (Diptera), C M Drake but can't decide between Geomyza majuscula or tripinctata. Can anyone with a bit more experience help, or is it not doable from the photos?

Thanks for your help

Ian


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#2 2017-06-18 13:48:07

oxycera
DF Members
Name: John Coldwell
From: Barnsley
Registered: 2008-04-27
Posts: 294

Re: Geomyza majuscula or tripinctata?

tripunctata sometimes has a yellow thorax. majuscula may perhaps be slightly larger than tripunctata but in practice can only be realistically separated on microscopic characters.

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#3 2017-06-18 19:00:08

IanCarle
DF Members
Name: Ian Carle
From: Herts
Registered: 2016-07-28
Posts: 58

Re: Geomyza majuscula or tripinctata?

Ok, thanks John

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