Thread subject: Diptera.info :: Two more Phasia?
#1
The first fly. July 01, 2006. Size 4.5-5mm.
#4
The second fly. July 01, 2006, on Carex. Size 6-7mm.
Posted by
ChrisR on 04-07-2006 12:43
#6
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
#7
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
#8
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

#9
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

#11
Thanks Chris and Nikita (I hope you don't mind me barging in your educated dialogue

) - I'll check the wing-tip later.
#12
Hello Chris,
I hope this picture would help you with the colour of hairs on genae.
#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

#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

#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.
#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

#20
Yes I see these clearly - thanks Chris