86 



ELEMENTARY STUDIES IN INSECT LIFE 



close by and watching the workers come with their little 

 pellets of wood-pnlp and spread the material skillfully 

 and frugally over the place desired. 



The yellow- jackets build nests of the same material, 

 but construct them of only a single layer of cells. They 



FIG. 08. Yellow-jackets (polistes sp.) and their nests. From a photograph. y 2 . 



locate them generally in some sheltered place, such as 

 under a large flattened rock which lies loosely upon 

 other rocks near the ground, or under a porch or simi- 

 larly sheltered place. 



The life history of these two kinds of wasps is much 



