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Dear Black, Nikita and Kahis,

This is a really great encounter!
As Merz (1994) states this species is really rare all over.
Moreover nothing is known on its biology, the same counts for most other species of Chetostoma. It is thought that the European species are connected with Lonycera, presumably in the fruits. Its charming sisterspecies C. curvinerve is found more often recently in western Europe. But also for this species it is not known where the larvae live. For this latter it is however known that the adults hibernate trough winter and can be found in autumn and (early) spring up to June. Perhaps this is the same with C. stackelbergi?? In any case do either of you know wether Lonycera was near the place you found the specimen? For it is unlikely that she would have laid here eggs in a birch stump, she was probably only feeding on the sapruns.

Cheers,

John