SAW-FLIES. 139 



of a row a thin partition of wood is left, forming a shallow 

 cell. 



The edges of this groove, it will be obvious, must be 

 farther apart than those which only contain a single egg, 

 and, in fact, the whole is open to inspection ; but the eggs 

 are kept from falling out, both by the frothy glue before 

 mentioned, and by the walls of the cells containing Ihem. 

 They were observed also, by Vallisnieri, to increase in size 

 like the preceding. 



