FIGURES 16–21 in Palaearctic Osmia bees of the subgenera Allosmia and Neosmia (Megachilidae Osmiini): biology, taxonomy and key to species

FIGURES 16–21: Osmia (Neosmia). 16: Female of O. rosea at the entrance of her nest, which is covered with numerous patches of leaf pulp (photo N. Vereecken). 17: Female of O. cinnabarina visiting Reseda lanzerotae. 18: Opened nest of O. bicolor with one brood cell and a nest plug composed of densely packed small pebbles and earth crumbs followed by a final partition of leaf pulp at some distance from the shell opening (photo A. Krebs). 19: Opened nest of O. cinnabarina with nest plug consisting of densely packed small pebbles. 20: Female of O. bicolor covering her nest with plant stalks (photo A. Krebs). 21: Nest of O. bicolor completely hidden under a dense pile of pine needles and plant stalks (photo A. Krebs).