174 



Insect Architecture. 



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 them. 

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

 like the preceding. 



[In the middle of summer, plenty of these grooves may be 

 seen, by looking at . the under lid of leaf-stalks or delicate 

 young twigs. Row upon row of the grooves are sometimes 

 found, so the all-destructive power of the insects must 

 indeed be great. The larvae, when full fed, dispose of them- 

 selves in various ways. Those of the gooseberry-fly, for 

 example (Nematus Hibesii), after they have stripped the bush 

 of its leaves, either seek the ground or remain on the 

 branches, and spin a series of cocoons, attaching them to each 



ooo, Saw-fly of the gooseberry (Nemitus Ribesii, STEPHENS) . 6, its eggs on the 

 nerv'ures of a leaf, d d, the caterpillars eating, c, one rolled up. /, one extended. 



branch by their ends. Those, therefore, who wish to destroy 

 these little pests, must know both localities of the cocoons, 

 or they will allow one half to escape while* destroy ing the 

 other.] 



