Figs. 16–21 in Nests, Petal Usage, Floral Preferences, and Immatures of Osmia (Ozbekosmia) avosetta (Megachilidae: Megachilinae: Osmiini), Including Biological Comparisons with Other Osmiine Bees

Figs. 16–21. More closed cells of Osmia avosetta. 16. Upper part of cell, side view, with petals of outer envelope partly removed to reveal inner soil lining capped with closure of soil with concave upper surface. 17. Close-up of same showing concave soil closure, top view. 18. Same cell, now with most of soil closure removed revealing some of petals of inner closure (arrow), top view. 19. Same, except now all of soil of inner closure removed revealing folded petal of inner envelope, top view. 20. Another cell with outer envelope teased open, soil closure removed, and inner envelope closure also teased open, top view. 21. Same cell with opening widened to reveal egg floating on provisions. (Photos J.G. Rozen).