A new guest on the bee hotel, a Blood bee (Sphecodes sp.) [1,2] male but unclear which species.
The name Blood bee refers to the red color on the abdomen plates.
He was walking around the Ridge-saddle carpenter bees and was interested in the same nest cells sizes. Without flying he worked his way across the bee hotel surface, visiting numerous holes and frequently taking a pause to observe the outside world.
Literature
1 Peeters, T.M.J., H. Nieuwenhuijsen, J. Smit, F. van der Meer, I.P. Raemakers, W.R.B. Heitmans, C. van Achterberg, M. Kwak, A.J. Loonstra, J. de Rond, M. Roos & M. Reemer 2012. De Nederlands bijen (Hymennoptera: Apidae s.l.). - Natuur van Nederland 11, Naturalis Biodiversity Center & European Invertebrate Survey - Nederland, Leiden.2 wildebijen.nl, "De Nederlandse bijen en hun relaties, overzicht van in Nederland en Vlaanderen voorkomende solitaire en sociale bijen (Apidea s.l.)"