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Location: Germany

While cleaning the windows today, I realized some dirt falling off the top of the window frame. By looking further, it seemed to be some kind of cocoon. (The first picture is very bad, I'm sorry) enter image description here

Those cocoons were about 2-3cm long. There was a total of 6 cocoons. Two were damaged by falling down. enter image description here

enter image description here

The last picture shows the inner part of the second picture I think. The larvae(?) was about 0.8cm to 1cm long.

Not sure if it matters, but the window is an attic window, located at the third floor. Do you have any idea, what kind of larvae it is?

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This is a neophyte that has been recorded in Europe since 1979:

Sceliphron curvatum, in German also known as orientalische Mörtelwespe. Unusually large considering what else is buzzing around, but mostly harmless.

The nests, or rather individual larvae cells, are made of mud and while there are about thirty species in the genus, only Sceliphron curvatum is found in Germany - there‘s no other wasp or other insect in Germany that builds similar nest cells, especially the size is a good indicator. Your description of nest location in a window frame is typical, curtain folds or (vertical) nooks in furniture, e.g. shelves are also welcome. Our specimen picked a hiding spot behind a few books a few years ago.

Because of their size, there are usually some articles about them in the low-news summer media lull, describing baffled citizens and their “discovery”. A few less sensational descriptions, photos and further information can be found here (sorry, in German).

Nice find!

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