FIGURES 18–22 in Preliminary Study of the Bumble Bee Bombus griseocollis, Its Eggs, Their Eclosion, and Its Larval Instars and Pupae (Apoidea: Apidae: Bombini)

FIGURES 18–22. SEM micrographs of reticulate chorion. 18. Close-up of exterior surface of reticulate chorion. 19. Same, except where reticulate chorion meets smooth chorions. 20. Edge of split of reticulate chorion with thin inner surface below and edge of outer structure along upper side. Note reticulate pattern of surface structure revealed through thin inner surface, 21. Close-up of central area in figure 20. 22. Close-up of parallel perpendicular lamellae from central area of figure 20 demonstrating complexity of outer ornamentation.