Stages in the reutilization of old Trypoxylon albitarse cells by T. nitidum. a Without reutilization (note T. albitarse emergence hole) b Reutilized with no emergence by T. nitidum (note closure without emergence hole) c Reutilized with emergence by T. nitidum (note smaller emergence hole). Scale bar = 1 cm. Figure by Terry Sampson.

  Part of: Nelson DM, Starr CK (2016) Comparative nesting success of the keyhole mud-dauber (Hymenoptera: Crabronidae: Trypoxylon nitidum) in different substrates. Journal of Hymenoptera Research 52: 163-167.