Need help identifying bee/wasp

[Dmrauch]

I need help to identify this insect which was helping itself to a rhubarb flower.[attachment=0][/attachment][attachment=1][/attachment]

Is it a bee or a wasp?

It is (I think) making its home in the crack between the solid, poured concrete steps and the concrete foundation of a house.  I can not see between these objects, so have no clue how much space is there.  I have seen one of these flying into the tiny hole between the two objects.  I did not stick my face up to the hole.

I live out west if that helps.

I would appreciate any help with identification. 

Dena

[mtnb]

It's a hoverfly.

[Dmrauch]

Thank you so much for the identification.   One of the good guys so we will let them be.   Have lots of wasps which we set out traps for.

[KeyLargoBees]

Wasps aren't all bad..... :-)