Diptera.info

Posted by philporter on 17-11-2011 11:37

Can anyone give me genus or better please?

Edited by philporter on 21-11-2011 10:00

Posted by Nikita Vikhrev on 17-11-2011 13:11

GB? Large, about 8mm?
Try to check Eutrichota praepotens

Posted by philporter on 17-11-2011 19:56

Nikita, many thanks but there is some confusion because all but one of the Forum references for Eutrichota praepotens show the femora yellow for this species, which is also implied in Michael Ackland's key. The visible genitalia are black and I think they should be orange? The specimen keys pretty well, I think, to the genus, although I am confused by the visibility or not of the sixth tergite, but beyond that I don't know. Is there variability?
Regards
Phil Porter

Posted by javanerkelens on 17-11-2011 23:27

We can't see if mentum of proboscis is black shining or grey dusted (grey dusted in E. praepotens),but we can see the lower calypter is longer than lower the calypter and should be the same in E. praepotens, so i think you have to check if it could be Hydrophoria lancifer.

Edited by javanerkelens on 17-11-2011 23:28

Posted by philporter on 18-11-2011 20:39

Thank you very much Joke, I can't check until Sunday.
Regards
Phil Porter

Posted by nielsyese on 18-11-2011 21:59

#10

I'm quite sure this will turn out to be Hydrophoria lancifer:)

Posted by Michael Ackland on 19-11-2011 10:51

#11

It is Hydrophoria lancifer. Hind femora in E. praepotens are yellow, as is the hypopygium and sternite V. I should add that Hydrophoria diabata, which is very uncommon, can only be separated from lancifer by details in the genitalia and postabdomen.

Posted by philporter on 20-11-2011 15:29

#12

That looks like a good diagnosis. The mentum is shiny. Does this view of the genitalia help?

Posted by Michael Ackland on 20-11-2011 17:05

#13

It is H. lancifer. The tip of the surstyli are not like a crotchet tool, and the epandrium is not elongated