solitary bee nest in a window frame 8 Jul 2013 07-28

solitary bee nest in a window frame 8 Jul 2013 07-28

Observation - solitary bee nest in a window frame 8 Jul 2013 07-28 - UK and Ireland. Description: Found this in a rarely-opened window. There are pupae and some tiny larvae present (2nd photo). I presume the pupae belong to a solitary bee. Are the larvae parasites, perhaps? I have made a separate observation for the larvae.

Found this in a rarely-opened window. There are pupae and some tiny larvae present (2nd photo). I presume the pupae belong to a solitary bee.

Are the larvae parasites, perhaps? I have made a separate observation for the larvae.