Diptera.info

Posted by JariF on 19-07-2010 13:39

Hi,

here four differend looking Tachinidae. This first one is a large, more than 10mm and fat female. July 17. 2010 Loviisa, Finland.

Jari

Edited by JariF on 21-07-2010 16:05

Posted by ChrisR on 19-07-2010 14:20

Can you check whether this one has a plumose/hairy arista? I can't see it on the photos but it might be just faint.

Posted by ChrisR on 19-07-2010 17:49

I'd go for one of those similar dexiines - Billaea/Dinera if the propleuron is bare or Estheria if it is hairy :)

Edited by ChrisR on 19-07-2010 17:49

Posted by ChrisR on 19-07-2010 18:31

Kinda ... once we agree that the parafacial is hairy:

3. The area around m-cu and the post-angular vein are browned. Basicosta brownish-yellow. Humeral callus in its basic colour at least partially yellow (seldom completely darkened). Body length 9 - 12 mm .......... picta Meig.

- The area around the said veins is not browned. Basicosta black-brown. Humeral callus black. Body length 9 - 14 mm .......... petiolata Bonsd.

Edited by ChrisR on 19-07-2010 18:32

Posted by ChrisR on 19-07-2010 22:34

ahh, sorry - I thought I could see hairs. Then in that case we get a different choice:

2. 4 Humeral bristles, the 3 strongest stand in a � straight line (as in fig. 80). 3 dc behind the suture. Petiole of R5 at most as long as r-m, usually much shorter. Scutellum predominantly yellow .......... cristata Meig.

- 5 Humeral bristles, the 3 strongest form a triangle (as in fig. 76). 4 dc behind the suture. Petiole of R5 longer than r-m. Scutellum black .......... bohemani Rond.

Edited by ChrisR on 19-07-2010 22:34

Posted by ChrisR on 20-07-2010 18:05

#13

Well, I can't see a central facial ridge, which should rule out Dinera ... your last photo doesn't show the propleuron - it's a bit below that (but above the spiracle) and sometimes has a few scattered fine hairs. :)

Posted by JariF on 20-07-2010 18:19

#14

Now I found what was confusing me as You wrote:
I'd go for one of those similar dexiines - Billaea/Dinera if the propleuron is bare or Estheria if it is hairy

The key says just the opposite:

Simultaneously: propleuron bare AND tergite 2 dorsally hollowed to the posterior edge. Tergites 3 and 4 with discal
bristles ............................................ Estheria (page 61)
􀀐 Propleuron hairy (as in fig. 90); when rarely bare or almost bare, then tergite 2 is hollowed at most to the middle.
Tergites 3 and 4 without discal bristles (at most with a few stronger hairs in the upright hairs on the posterior edge
of males) .................................................. 15

:)

Jari

Posted by Zeegers on 21-07-2010 10:47

#15

It is not Estheria, since there is no petiole (this reasoning is valid in Finland, not in Spain.).

What about Billaea ?

parafrontals hairy (> 20 small hairs) -> Billaea
parafrontals virtually bare (< 20 hairs) -> Dinera

If Dinera, it must be ferina, in which case you'd have DC 3+4 and excavation on syntergite 1&2 complete.

Theo

Posted by JariF on 21-07-2010 16:05

#16

It has around ten very tiny hairs on parafontals and DC 3+4 so I belive this case is closed and we have a name :) This was so interesting that it made me to load the key again and study it closer. Thank You for help.

Jari