Hello all,

First of all I hope I am in the good forum for this request.

A friend photographied that nest within a Eastern bluebird nest box in Sherbrooke, Quebec, Canada (near Vermont, USA).

It doesn't look as a hemynoptera nest but I think it is something created by diptera larvae. Am I wrong???

Any idea about which kind of insects (family/genus/species) built it???

Thank you,

Michel