Margined Calligrapher (Toxomerus marginatus)
Mating Eastern Calligraphers (Toxomerus geminatus)
Variable Duskyface (Melanostoma mellinum), male I think.
Variable Duskyface female.
Pollen-dusted Black-shouldered Drone Fly (Eristalis dimidiata)
Dandilions and henbit deadnettle the flowers here.
Plus, as an extra bonus you also get this recent march fly observation:
Bibio genus something. Check out that beetle-like head.
Backyard and Beyond 
Margined Calligrapher! What a name!
And that pattern. Talk about branding!
Looks like good bird food to me.
I had to look up flower flies because they looked like hoverflies to me. No wonder – just a different common name. I don’t remember seeing these varieties – I’ll have to look more closely if I’m ever able to get out again.