Nesting site and nesting material are unknown. However, Haetosmia possibly nests in excavated burrows in sandy soil as indicated by the following observations: all three species seem to be restricted to sandy ground (Mavromoustakis, 1954b for Haetosmia vechti; A. Müller and C. Sedivy, personal observation for H. circumventa; C. Praz, personal observation for H. brachyura); in addition, the females possess long bristles on tibia and tarsus of their forelegs, which are possibly used to flip away sand during nest excavation in the ground.
Masticated green leaves of Heliotropium (Boraginaceae) are used to construct the brood cells (Gotlieb et al., 2014)