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The Society for the study of flies (Diptera)

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#1 2019-06-10 15:59:09

colinleb
DF Members
Name: Colin Le Boutillier
From: Luton, Bedfordshire
Registered: 2008-03-03
Posts: 246

Tephritis divisa?

Here is another example of a fly which until recently I would have thought of as Tephritis neesii because of the dark cell SC and absence of hyaline spots adjacent to crossvein r-m.  However I have posted pictures of two others recently which Laurence Clemons and Tony Irwin have suggested look more like T. divisa .  Neither specimen has a definitive ID yet.

Looking at the rather washed out figures in my copy of Bernhard Merz’s Insecta Helvetica 10 and those in Ian White’s earlier RES key plus lots of images online (many clearly wrongly named), I find it difficult to be sure exactly which hyaline wing spots are diagnostic for which species.  A further complication seems to be the similarity of T. separata to T. divisa .

I am at least fairly sure that this specimen has all white setae on the tergites except for a few long terminal black ones.  Vein r4-5 has a few small well-spaced bristles ventrally.

Is an ID possible from this photo or can these only be done with the specimen in the hand, and not always then?

Beds.  4 June 2019.


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Last edited by colinleb (2019-06-10 16:02:18)

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#2 2019-06-11 11:24:11

adamwright
DF Members
Name: Adam Wright
Registered: 2009-02-12
Posts: 29

Re: Tephritis divisa?

Looks good for T. divisa to me. In cell m the dark areas are a lot thicker in T. neesii than in T. divisa.

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#3 2019-06-21 16:58:48

colinleb
DF Members
Name: Colin Le Boutillier
From: Luton, Bedfordshire
Registered: 2008-03-03
Posts: 246

Re: Tephritis divisa?

Thanks Adam.

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