Yesterday I noticed a small (+/- 4 mm long) cuckoo wasp on the bee-hotel in which many Osmia cornuta and Osmia bicolor are nesting. I cought the animal and managed to take a couple of pictures before it escaped when trying to take more detailed pictures. Is there any chance at putting a name to this animal? Someone on Facebook suggested Pseudomalus triangulifer, which looks similar, but I don't know if that could be certain.
Thank you kindly for your help!