38 



HOW INSECTS ARE CLASSIFIED 



monidae Chalcididse, and others. With these the abdomen is joined 

 to the thorax by a narrow waist. 



Fig. 



Adult winged ant. Enlarged and natural size. Original. 



Finally there are the stinging Hymenoptera, which also are narrow- 

 waisted, like the boring Hymenoptera. T3^ical specimens are the 



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 

 Fig. 40. — A wasp, Sphecina. Original. SUperfamilies : 



