FIGURES 1–7 in Nesting and Developmental Biology of the Cleptoparasitic Bee Stelis ater (Anthidiini) and Its Host, Osmia chalybea (Osmiini) (Hymenoptera: Megachilidae)

FIGURES 1–7. Trap nests used in the study of Osmia chalybea and Stelis ater. 1. Two trap nests deployed in the field. 2. Front end of U-shaped trap nest. 3. Front end of circular trap nest, showing circular openings to boreholes lined with paper straws and unlined; note that two exhibit nest closures. 4. U-shaped trap nest seen