PLATE VI. 
Fig. 1. Embryo nest of V. Crabro, from a stable roof. The 
rudimentary cells are only four. The short thick foot- 
stalk, the absence of any hood, and the strong diverging 
roots of the pedicle, contrast with the structure of the 
smaller species shown in the preceding plate. Natural 
size. p. 212. | 
Fie. 2. Embryo nest of V. sylvestris, attached to a twig, 
displaying the bell shape which characterizes this species. 
Natural size. p. 217. 
