Here is an old nesting block that has osmia cornifrons aka japanese hornfaced bees nesting in it. The block had split down the middle. Inside the block, where the bee larva should be, there was a larva of something else. I kept the block in an enclosed area to see what would emerge, and it turned out to be a parasitic wasp. Does anyone know what kind of wasp this is? The wasp is a shiny metallic blue color.
here are pictures of the wasp and the nesting block:
Here you can see the wasp standing on the left side of the nesting block: