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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

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Lepidoptera, Pyralidae, Galleriinae, Aphomia sociella or a related species

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Thank you very much Tony!

I think you are rigjt! It can easily be a parasited bumblebee nest by a colony of Aphomia sp.

Aphomia sociella is not present in Quebec but a related species of the same genus could be the culprit.

Thanks alot!

Michel