Egg, larva, pupa

I found this very nice chart at http://hwbka.org.uk/wp-content/uploads/2015/01/Bee-LifeCycle-Chart.pdf

And there's some nice blog stuff, too: https://hwbka.org.uk/just-as-you-feared-wasps-are-menacing-because-they-are-smarter-than-bees/