Thread subject: Diptera.info :: Chalcosyrphus? (Myolepta obscura)

Posted by christoophe on 01-05-2011 08:10
#1
Hello

it lacks the dark bands on the mesonotum.
The first tergite is lead color.
I think Chalcosyrphus eunotus.

www.galerie-insecte.org/galerie/image/dos69/big/img_4790.jpg
lauriaut : France : Lourmarin : 84 : 25/04/2011
Altitude : 250 - Taille : 9-10 mm
Réf. : 69143

www.galerie-insecte.org/galerie/image/dos69/big/img_4801.jpg
lauriaut : France : Lourmarin : 84 : 25/04/2011
Altitude : 250 - Taille : 9-10 mm
Réf. : 69144

www.galerie-insecte.org/galerie/image/dos69/big/img_4787.jpg
lauriaut : France : Lourmarin : 84 : 25/04/2011
Altitude : 250 - Taille : 9-10 mm
Réf. : 69145
Edited by christoophe on 19-09-2011 18:13

Posted by Menno Reemer on 01-05-2011 12:33
#2
It's a Myolepta. Consider, for instance, vein R4+5 and M1: they join almost at the wing margin. It seems to be M. obscura, because of the quite long hairs on mesoscutum and scutellum. In order to be sure, check the metasternum (small sclerites between mid and hindlegs): if it's bare, it's M. vara. If it's pilose (hairy), then it's M. obscura. For more characters see PDF at:
http://science.naturalis.nl/media/224421/reemer_etal_2005_myolepta_smallversion.pdf

Posted by Andre on 01-05-2011 14:32
#3
And if you found out which one it is, these pics are great for the Syrphidae gallery!

Posted by christoophe on 01-05-2011 16:40
#4
Metasternum is bare, so Myolepta vara.
Thank you Menno.

I don't forget the gallery, Andre.

Posted by christoophe on 19-09-2011 18:12
#5
It's Myolepta obscura.
I checked with the key given by Menno.http://science.na...ersion.pdf
There is an inversion of the criterion metasternum mentioned above by Menno, it is bare for obscura, and hairy for vara.
We must change the gallery also.