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Explanation of Plate IV. 
Fig. 1. Longitudinal section of nesting block, showing 
glass tube in position and nest no. 2 containing four cells, each 
with its egg and caterpillars. natural size.) 
Fig. 2. Nest built by Ancistrocerus sp. showing three cells 
with larvae in cocoons. natural size.) 
Fig. 3. Egg of Ancistrocerus sp. with suspending filament. 
(This and the next two figures enlarged about fifteen times). 
Fig. 4. Same egg as in figure 3, about to hatch. 
Fig. 5. Larva (just hatched from egg shown in figure 3) 
suspended from the shrunken chorion. 
