Figures 20-25 from: Müller A, Praz C, Dorchin A (2018) Biology of Palaearctic Wainia bees of the subgenus Caposmia including a short review on snail shell nesting in osmiine bees (Hymenoptera, Megachilidae). Journal of Hymenoptera Research 65: 61-89. https://doi.org/10.3897/jhr.65.27704

Figures 20-25 20Osmia (Pyrosmia) viridana at nest entrance (photo N. Vereecken) 21Protosmia (Protosmia) paradoxa on snail shell (photo N. Vereecken) 22Osmia (Hoplosmia) spinulosa turning its nest in situ 23Osmia (Allosmia) rufohirta rolling its nest towards a protected place 24Osmia (Allosmia) sybarita rolling its nest into a self excavated hole in sandy soil (photo N. Vereecken) 25Osmia (Neosmia) bicolor covering its nest with plant stalks (photo A. Krebs).