Posted by Ectemnius on 14-01-2014 18:53
#2
Hello Pavel Vojtek,
Welcome! These are Syrphidae of the genus Merodon. Looks like M. constans, but there are a lot of similar species, so I'm not sure.
(It's usual to ost Syrphidae in the appropriate subforum...)
Greetings,
Ectemnius