Posted by John Carr on 09-09-2011 20:56
#2
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