Diptera.info

Posted by pierred on 09-09-2011 20:28

On our French forum, we got those pictures :

www.galerie-insecte.org/galerie/image/dos76/big/110902_042.jpg

J�r�mie Lemari� : France : Sainte Rad�gonde des noyers : 85450 : 02/09/2011
Altitude : 0-7 m - Taille : 9 mm mesur�
R�f. : 76616

www.galerie-insecte.org/galerie/image/dos76/big/110903_012.jpg

J�r�mie Lemari� : France : Sainte Rad�gonde des noyers : 85450 : 03/09/2011
Altitude : 0-7 m - Taille : 9 mm mesur�
R�f. : 76617

www.galerie-insecte.org/galerie/image/dos76/big/110903_019.jpg

J�r�mie Lemari� : France : Sainte Rad�gonde des noyers : 85450 : 03/09/2011
Altitude : 0-7 m - Taille : 9 mm mesur�
R�f. : 76839

Does somebody have an idea ?
Thanks in advance.

Posted by John Carr on 09-09-2011 20:56

In temperate North America the three common genera of Bibionidae are distinguished by the number of openings in the posterior spiracle:
1: Penthetria
2: Bibio
3: Dilophus

I think your larva has 2.

Edited by John Carr on 09-09-2011 20:56

Posted by atylotus on 10-09-2011 09:53

I agree with John, and this is also true for Europe. I can add that Penthetria is more a species of wet earth along brooks and resembles the Cylindrotomatidae species Phalacrocera replicata in habitus. Bibio and Dilophus are (in general) species of dryer earth. You may identify the species using the key in Skartveit (2004) (see no. 17 in http://www.entomo...tabell.htm) or download directly http://www.entomo...ler_17.pdf. It is in the norwegian language, but nowadays you have good internet translators.