38 HOW INSECTS ARE CLASSIFIED 
monidze Chalcidide, and others. 
to the thorax by a narrow waist. 
With these the abdomen is joined 
Fic. 39.— Adult winged ant. Enlarged and natural size. Original. 
Finally there are the stinging Hymenoptera, which also are narrow- 
waisted, like the boring Hymenoptera. Typical specimens are the 
Fic. 40.— A wasp, Sphecina. Original. 
common bees, wasps, and ants. 
It is within these families 
that we find social develop- 
ment at its height. Few in 
this section are classed as in- 
jurious, the exceptions being 
found principally among the 
ants. 
The stinging Hymenoptera 
are divided into the following 
superfamilies : 
