Diptera.info

Posted by Zeegers on 11-09-2021 20:30

Suwalki and Bieszczady are both eastern Poland, but quite different. Could you please be more precise ?

Head is large and antenna is short, so my first impression is fulvus.

If you have other angles, please post.

Thanks

Theo

Posted by rafalk on 12-09-2021 16:29

In the middle - near Lublin city.
In A.fulvus male median stripe on abdomen is absent. Info from key to Tabanidae of Croatia:

median stripe on abdomen absent.
A darker, black pubescent median stripe dorsally on abdomen. Femur black-gray at least on basal part latistriatus (Brauer in Brauer and Bergenstamm)
• Abdomen is dorsally pale pubescent with some black hairs, darker median stripe absent 4
4(3) Orange-yellowish species, abdomen golden-yellow pubescent, sometimes with few black hairs 5
• Yellowish-gray to grayish species with grayish pubescence. Abdomen mostly grayish with broad yellow margins on
anterior 3 tergites, mostly covered with grey hairs. Femur gray, apically yellowish (Figure 68, 69) rusticus (L.)
5(4) Head large, eyes with short pubescence. Yellowish-brown species with grayish notopleural lobes fulvus(Meigen)
• Head smaller, eyes with long hairs. Golden-yellow species with yellowish notopleural lobes, (Figure 70, 71)
loewianus

That's why I have doubts

Posted by Zeegers on 13-09-2021 07:28

OK, thanks
According to this key, the black band should be absent as well in loewianus, so I don’t see how that helps you.

However, the black band refers to a band of black hairs, not dark tergite ! This formulation is the classical one, but for me, it does not work. See the new Fieldguide.

Eye size and esp. lenght of hairs on eye are very reliable to separate loewianus from fulvus. From this angle, I am not totally sure.
That said, the third antennal segment is very short, contradicting loewianus. Fulvus is definitely present at Lublin, loewianus might be at the border of its distribution.

So, though not certain, most facts favour fulvus.

Theo

Edited by Zeegers on 14-09-2021 07:03