Renter: Existing cavities. The females nest in existing cavities in vacated insect burrows in dead wood and drilled borings in wooden blocks; hollow stems (e.g. Arundo) and drilled borings in pithy stems; cavities and holes in rocks, stones or walls; hole in a large key; glass tubes. The nests are linear.
Nesting material: Cell partitions and nest plug are made of chewed leaves (e.g. from Phlomis, Malva). (Banaszak and Romasenko, 2001; Benoist, 1931; Brechtel, 1986; Ferton, 1892; Friese, 1923; Stoeckhert, 1933; Vicens, Bosch and Blas, 1993; Westrich, 1989; G. Le Goff, personal observation)