Posted by Zeegers on 12-05-2020 14:53
#6
B. varipes tends to be rather solitary. Those clouds of Bibio are johannis, lanigerus or sometimes nigriventris, but I never found varipes in these clouds.
Varipes is more a woodland species.
Here, in NL, johannis is the first to appear, from the first day of april or even end of march. These regional differences are stunning (and confusing).
Theo