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Hello everybody. Yesterday a friend from the local museum of natural history www.inatura.at asked me if I could help him identify a larva which I thought to be a syrphid. With the (old and for sure incomplete) key I have I come up to Pipiza or Heringia which I don't really believe.

1. The length of the larvae is 13mm (without stigmata-"horn" which has another 1mm length).
2. The larvae have been found inside houses in three cities/villages around here (Dornbirn, Feldkirch and Egg, all in Vorarlberg/Western Austria) during the last week: Some in a guestroom which is not used very often, some in the corner of a room on the floor with mice's feces around and some "falling from the ceiling" according to the people who brought the larva to the inatura.

I'd appreciate information on the species or genus and about what they were doing inside the rooms, as the people here have asked for this kind of info. I think it's the same species as in the pictures above

Thanks in advance


Here is a photo of dorsal and ventral view (Photos by Klaus Zimmermann)