Hoplitis tridentata 1 nest entrance in a dead stem of Verbascum 2 female entering her nest at the broken tip of a dead stem of Verbascum (photo A. Krebs) 3 linear series of brood cells within a dead stem of Rubus each containing a prepupa inside the cocoon 4 trapnest bundle consisting of five 50 cm long stems of Rubus 5 experimental nest stem with exposed brood cell.