FIGURES 15–20. 15, 16 in Early nesting biology of the wood-nesting adventive bee, Lithurgus chrysurus Fonscolombe (Apoidea: Megachilidae: Lithurginae)

FIGURES 15–20. 15, 16. SEM micrographs of pollen of Centaurea sp. from larval provisions of Lithurgus chrysurus and of Opuntia sp. from larval provisions of Lithurgopsis apicalis, to same scale, respectively. 17. SEM micrograph of egg of L. chrysurus, showing micropyle. 18–20. Dorsal views of integument of abdominal segment 3 of various instars of Lithurgus chrysurus showing surface textures. 18. Third instar. 19. Entire anterior part of body of fourth instar showing projecting caudal annulets ringing thoracic and anterior abdominal segments. 20. Close-up of abdominal segment 3, identified by rectangle in figure 19.