Diptera.info

Thread subject: Diptera.info :: Love parade !

Posted by pat_der2003 on 07-09-2007 17:53

is it possible to call those Syrphidae "Eristalis arbustorum" or they are only Eristalis sp ?

loire-atlantique, France, july 30 2007.

Posted by pat_der2003 on 07-09-2007 17:54

the female :

Posted by conopid on 08-09-2007 14:45

Probably E arbustorum - the face does not appear to have a dark stripe down its centre.

Edited by conopid on 08-09-2007 14:45

Posted by pat_der2003 on 10-09-2007 08:09

Thank you !! ;-)

Posted by Menno Reemer on 10-09-2007 08:44

I'm afraid I have to disagree. The very small pterostigma indicates that it is E. nemorum (= interrupta). And in males E. arbustorum the 3rd tergite usually has larger yellow markings. Besides, this behaviour is typical for Eristalis nemorum. E. arbustorum doesn't do things like this.

Posted by conopid on 10-09-2007 21:25

I think you may be right, as the stigma does appear to be sharply defined. However I find that the orange markings vary considerably in both species.

I am sure that I have seen E arbustorum exhibitng this behaviour, or perhaps I should be making a much closer inspection of courting pairs (or triples)? What have others found?

Posted by pat_der2003 on 15-09-2007 13:00

here is a triples ... (but i can't say if it is the same species !)

thanks to both of you !

Posted by conopid on 15-09-2007 17:48

Oh lovely shot and the facial stripe is clear, so that is E interruptus.

Posted by pat_der2003 on 17-09-2007 08:29

thank you !