FIGURE 1–4. 1 in Palaearctic Chelostoma bees of the subgenus Gyrodromella (Megachilidae, Osmiini): biology, taxonomy and key to species

FIGURE 1–4. 1: Chelostoma rapunculi, brood cells with larval provisions consisting of purple Campanula pollen and separated from each other by partitions made of mud (Photo W. van der Smissen). 2: Chelostoma rapunculi, nest plug made of mud with pebbles and sand grains embedded into its outer surface (Photo W. van der Smissen). 3: Chelostoma rapunculi, pollen-collecting female on Campanula rapunculus (Photo A. Krebs). 4: Chelostoma rapunculi, male sleeping attached to a grass spike.