Flys for ID

[PeterD]

Can anyone please help with these?







Thank you

[JRsbugs]

#1 Therevidae, Thereva sp. The one I have is Thereva nobilitata but there are others so you might try checking the keys if you can see the relevant bits.

http://home.hccnet.nl/mp.van.veen/th...herevidae.html

#2 probably Muscidae, Phaonia subventa female.. there's two similar ones but this seems to match mine.

#3 Lauxaniidae, looks like Meiosimyza decempunctata but you might want to get that comfirmed, it is on our list and the spots match up.

Janet

[oxycera]

It is diificult to quite make out the number of pre-suteral acrostichals; it is possible that there are 2 pairs which would make subventa most likely, although other features such as the extensively yellow scutellum perhaps suggest rufiventris.
The position of hairing between the spiracle and hypopleuron is a good distinguishing character but would need very precise and skillful macro work to see it in a photo.

[JRsbugs]

Originally Posted by oxycera

It is diificult to quite make out the number of pre-suteral acrostichals; it is possible that there are 2 pairs which would make subventa most likely, although other features such as the extensively yellow scutellum perhaps suggest rufiventris.
The position of hairing between the spiracle and hypopleuron is a good distinguishing character but would need very precise and skillful macro work to see it in a photo.

Phaonia subventa often has only a small amount of dark colouring at the base of the scutellum, the number of leg bristles on the mid tibia and length of hairs on the arista can help if visible. P. rufiventirs usually has more extensive orangey colouring along the edges of the thorax, I have had that too.

The two posterior setae on the mid tibia in the photo here are visible, I think they can sometimes have three but the others don't have two.

Check out this thread.

[oxycera]

Certainly subventa has 2 posterior bristles, which are clearly visible.
The rarer bitincta has 3.
All my rufiventris have 2 bristles, however, so I would appreciate the reference just in case I need to re-name them.

[JRsbugs]

Originally Posted by oxycera

Certainly subventa has 2 posterior bristles, which are clearly visible.
The rarer bitincta has 3.
All my rufiventris have 2 bristles, however, so I would appreciate the reference just in case I need to re-name them.

Did you check the link I gave above with photos and description of each?

If you search the site on diptera.info you should find references in older threads, if anyone knows Muscidae it's Stephane, I found a thread where he mentions rarely that subventa has 3 midtibia posterior bristles.

Diptera.info - Discussion Forum: Phaonia resembling rufiventris

On this thread is what you want:

To discriminate between P. rufiventris and P. subventa, I cite Stéphane Lebrun:
"Phaonia rufiventris: 1 presut ac. ; scutellum entirelly orange (at most darkened at extreme base ; mid tibia with 3-4 post. setae; fore tibia without p. setae.
Phaonia subventa: 2 presut ac. ; scutellum almost always broadly darkened at base ; mid tibia with 2 p. setae ; fore tibia with p. setae.
(There is a third one, Phaonia bitincta)."

If you need to confirm this, then post on diptera.info and I'm sure you will get an answer.

[oxycera]

Some bristles of my rufiventris series were detached, the mid tibia does have 3 posterior bristles. If that is consistent then it could be a useful character.
I can only assume that there is a pair of presut acros missing from the photographed specimen.

[oxycera]

I replied before I got your reply.
Thanks for taking the time to respond.

[PeterD]

Thank you all for your contributions to this thread. I have had confirmed Meiosimyza decempunctata on the diptera website.