Diptera.info

Posted by Pepik on 17-12-2011 20:56

Hello forum, please ID
photo 27.7.2010, size 5-6mm,Czech republic
Thank you

Posted by Stephen R on 18-12-2011 15:45

A male Hydrophoria. In Britain this would key to H. linogrisea.
The yellow postpedicel and genital segments and the lack of darkening on the fore-femur seem unusual compared with the few images I have seen,but they may well be within normal variation. (I see Fauna Eur. lists an Asian species H. rufitibia which has appeared in Germany and Greece, but I know nothing about it.)

Posted by Stephen R on 18-12-2011 16:20

Now I've found Suwa's 2002 paper http://eprints.li...09-127.pdf in which he retracts the identification of the German H. bavarica with the Japanese H rufitibia. It's probably irrelevant anyway. The paper makes little mention of colour, and you can't know anything without a good view of the genitalia, but one characteristic of the group is the shortness of the ad seta on t1 compared with the neighbouring setulae - not the case here, so probably H. linogrisea is correct. Michael?

Edited by Stephen R on 18-12-2011 16:21

Posted by javanerkelens on 18-12-2011 17:20

1av on hindtibia and sternite V / hypogygium seems orange/yellow, so maybe Eutrichota praepotens....

Posted by Stephen R on 18-12-2011 21:18

That would account for my uncertainty :D but at least I learned a few things!

(Corrected for grammar!)

Edited by Stephen R on 20-12-2011 00:01

Posted by Pepik on 19-12-2011 11:13

Sara,Stephen,Javaner..., thank you very much for your interest
send more details
Pepik

Edited by Pepik on 19-12-2011 11:17

Posted by Stephen R on 19-12-2011 23:59

#11

It's clearly E. praepotens - only an idiot would think otherwise. :S Still, public embarrassment is very character-forming |t

Posted by javanerkelens on 20-12-2011 00:54

#12

I also was fooled at first.
So don't feel bad about it!!!!

Joke |t

Edited by javanerkelens on 20-12-2011 10:01