Diptera.info

Posted by Dmitry Gavryushin on 04-07-2006 10:02

The first fly. July 01, 2006. Size 4.5-5mm.

Posted by Dmitry Gavryushin on 04-07-2006 10:06

The second fly. July 01, 2006, on Carex. Size 6-7mm.

Posted by ChrisR on 04-07-2006 12:43

Lovely photos, again!

1. looks like Phasia obesa (female) - if it has yellow hairs on the gena.
2. isn't a Phasia sp. - I think it is more like Cistogaster, Clytiomya or Eliozeta. I can't quite see if the wing is petiolate or not - can we see a photo with a clearer wing-tip?

(sorry, no matter how good the photo I always seem to ask for more!

)

Edited by ChrisR on 04-07-2006 12:53

Posted by Nikita Vikhrev on 04-07-2006 12:47

Chris, I have to disagree about first one.
My test it is male, Phasia barbifrons.
Nikita

Posted by ChrisR on 04-07-2006 12:55

Hi Nikita, Fly-1 does have yellow haltares but it also has a lot of grey dusting on the thorax, which is more characteristic of Phasia obesa. The colour of the hairs on the gena is apparently a very good way to split obesa from barbifrons in difficult specimens

Posted by Nikita Vikhrev on 04-07-2006 13:05

Hi Chris.
I compared Black's fly my photos of Ph. obesa and Ph. barbifrons and collected Ph. barbifrons I have. My Ph. obesa has much more dusting thorax, but Ph. barbifrons has not dust at all.
So, it seems you are right, I'm wrong.

Posted by ChrisR on 04-07-2006 13:33

#10

In the key it says that in Phasia barbifrons is *should* have a completely dark thorax ... but just as obesa *should* have a heavily dusted thorax there are occasions where the features are not as they should be

So, last week Peter Tschorsnig said this hair colour on the gena is a nice way to split off obesa from the other 2 small ones easily ... so more work for Dima

Posted by Dmitry Gavryushin on 04-07-2006 20:17

#11

Thanks Chris and Nikita (I hope you don't mind me barging in your educated dialogue

) - I'll check the wing-tip later.

Posted by Dmitry Gavryushin on 14-07-2006 11:20

#12

Hello Chris,
I hope this picture would help you with the colour of hairs on genae.

Posted by Dmitry Gavryushin on 14-07-2006 11:31

#13

Chris, I hope this picture would tell you more about the second fly.

Posted by ChrisR on 15-07-2006 20:16

#14

Hi Dima - sorry for the delay but I missed these updates for a day or two. The Phasia is now definitely P.obesa - lovely photo of the gena

I'll get back to you on the orange one

Posted by Dmitry Gavryushin on 15-07-2006 20:21

#15

Thanks Chris - actually I had some network problems and no Internet access in last 24hrs.

Posted by ChrisR on 16-07-2006 11:53

#16

I have keyed the little orange fly as best I can (using the Palearctic genera software key + the Central European key) and it comes out to Eliozeta helluo but I don't have any examples to check it against.

Perhaps you or Nikita can check Russian references to see if you can find specimens to check against. Fauna Europaea has a nice map that shows it should reach your part of the world: http://www.faunae...on1=144281

Posted by Dmitry Gavryushin on 16-07-2006 12:19

#17

Hello Chris, what a impressive name! Hope Nikita could check it somehow. Thanks a lot

. One more Tachinidae from my balcony in a few minutes.

Posted by Dmitry Gavryushin on 23-07-2006 21:43

#18

Hello Chris, could this be the same one? July 23, 2006, our town park, swept from grasses near water, size 7mm.

Posted by ChrisR on 23-07-2006 23:03

#19

It certainly looks like one - but older and tatty with rubbed-off bristles on the abdomen - you can still see the bristle sockets there the marginals used to be