atylotus wrote:
Looks more like a larva.
and what about Piophilidae?

Nosferatumyia wrote:
Neottiophila, the bird nest parasite of the Piophilidae, is not so small, guess, it must have a pupa c. 5-7 mm long. This your "pupa" is actually a prepupa, a larva just befor pupation.

But, otherwise, sorry, I cannot tell, what's this.

Andrzej wrote:
http://www.miiz.w...tr49-2.pdf - an abstract on the paper on Neottiophilum puparium by Draber-Monko. Andrzej

When fully grown the larvae
are 10.5 mm. long and 2.8 mm across the middle. The anterior
portion of the body is narrow and pointed and the posterior is
wide. The segmentation is not well marked and is partly hidden
by accessory protuberances and transverse folds. The head and
mouth are adapted for the parasitic mode of life, quite unlike an
ordinary carrion-feeding blow-fly. When fully fed the larva may
become dormant and remain in the nest for some months before
pupation.

The pupa is blackish and retains the
characteristic shape of the larva, even the segmentation, and it is
thus easily recognisable from the pupa of Protocalliphora which
is smooth and like that of a blow-fly. The pupae remain in the
nest until the following spring when the flies emerge, usually in
March, April and May.

andrzej grzywacz wrote:
Your larva is indeed Protocalliphora. It can be P. azurea, but I am not able to identify species. On the first photo you can see characteristic ring of spines surrounding pseudocephalon at the bottom.