Posted by Ocellar view on 27-04-2017 09:55
#1
Found on 05 April 2017 in Switzerland, Kerzers (447 m)
I suppose
Syrphus ribesii. Is this plausible?
Posted by treebeard on 27-04-2017 16:04
#2
I am afraid we can see not enough to be sure. I cannot guess whether the eyes are bare or hairy (if ribesii, they should be bare) and if the hind femora is prevalently yellow (the part we can see is yellow).
Posted by Juergen Peters on 27-04-2017 21:02
#3
Hi,
treebeard wrote:
and if the hind femora is prevalently yellow
isn't that decisive only for females?
Posted by Ocellar view on 28-04-2017 07:33
#4
treebeard wrote:
I am afraid we can see not enough to be sure.
Fortunately, I have collected the specimen and checked the following:
- Basal 2/3 - 3/4 of hind femora are black which seems to be typical for
S. ribesii males
- Eyes are bare (rules out
S. torvus)
- Second basal cell is completely and evenly covered with microtrichia (rules out
S. vitripennis)
I think this should characterize it as
S. ribesii. However due to a lack of trustworthy literature I am not quite sure.
Best,
Ov
Edited by Ocellar view on 28-04-2017 07:34