FIGURES 19–23 in Nest Site Selection and Nesting Behavior of the Bee Lithurgopsis apicalis (Megachilidae: Lithurginae)

FIGURES 19–23. Microphotographs of nest components of Lithurgopsis apicalis. 19. Assorted discs showing variation primarily in views of posterior surfaces from numerous cells. 20. Young larva, probably first instar, facing posterior surface of disc, but not yet feeding. 21. Two preserved eggs, side view. 22. Newly emerged fifth instar compared with fully grown fifth instar. 23. Plastic rearing dish containing five live larvae, which permitted us to observe feeding and cocoon-spinning activities throughout the study period.