Renter: Existing cavities. The females use cavities in stones and rock crevices, stones and walls; rarely in hollow stems or in abandoned cells of Megachile (Chalicodoma) parietina. The cells are of an irregular shape and are covered with a common layer. (Banaszak & Romasenko, 1989)
Nesting material: The cells, which are built side by side, entirely consist of chewed leaves (e.g. of Helianthemum, Cytisus). While in larger cavities the entire cells are built from leaf pulp, only the side walls are built in narrow cavities. The outermost layer of the nest consists of empty cells. Often, several females communally nest in the same fissure or cavity. (Banaszak and Romasenko, 2001; Bonelli, 1967; Friese, 1895, 1923; Grandi, 1961; Müller et al., 1997; Stoeckhert, 1933; Westrich, 1989)