Thread subject: Diptera.info :: Syrphus ribesii or vitripennis?

Posted by ChrisR on 23-04-2008 19:10
#1
Saw this yesterday (22/4/2008) in southern England. Is it Syrphus vitripennis or ribesii? Is the yellow area on the femora big enough to be ribesii?

Posted by ChrisR on 23-04-2008 19:11
#2
lateral...

Posted by Dieter on 23-04-2008 19:59
#3
The colour of the femora is of no use to distinguish ribesii males from vitripennis. The crucial characters (microtrichia on cell bm, shape of probasisternum, setae on posterior mesocoxite) are usually not visible on fotos.

Cheers,
Dieter

Posted by ChrisR on 23-04-2008 20:48
#4
OK, no problem - thanks for the information Smile