#1
I can't come to some genus. Non Suillia.
Moscow, park, 22 apr (no green grass or flowers yet), on tree bark, 4-5mm.
#4
I'm always patient

Thank you Andrzej.
Now I can go by key once more and find my mistakes!
Nikita
P.S.
1. This male is from copuleted pair. Female is also collected.
2. Same date - one more Heleomyzidae. I hope it wouldn't take too much of your time. I need only confirmation whether Suillia is affinis.
http://www.diptera.info/forum/viewthread.php?forum_id=5&thread_id=1491