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D) Flat nests with removable, interchangeable cells 
Two types were tested: one formed of transparent and opaque 
gelatin capsules inserted into holes drilled in the cage wall (Fig. 4), 
and one consisting of 80-82 plastic straws cells gathered in a plastic 
container which fit into a hole (</> 58 mm) in the cage wall (Fig. 5). Flat 
nests allow for the observation of individual larvae as each cell can be 
removed and controlled. Construction was prohibited in order to 
maintain the form and visibility of the artificial nests. The results 
obtained on these nests are shown in Table I. Nine out of 12 nests of 
Fie. 4. Flat gelatin-capsule nest before and during use. 
Fig. 5. Flat plastic-straw nest viewed from outside and inside the cage. 
