Bionomics of Hoplitis mitis A nest in dorsal view consisting of three brood cells, which were hidden among dead blades in a grass tussock (Surses, Grisons, Switzerland) B same nest as above in frontal view with one brood cell still being provisioned C inner surface of brood cell D nest consisting of three brood cells, which were hidden under a removed stone (Zeneggen, Valais, Switzerland) E single brood cell, which was hidden in dense plant litter (Val Piora, Ticino, Switzerland) F single brood cell attached to a stem (St. Pierre, Aosta Valley, Italy) G female collecting pollen on Campanula rotundifolia (Bräntschu, Valais, Switzerland).