152 NATURE STUDY AND AGRICULTURE 



Following the lessons on the bumblebee their relatives 

 should be taken up for a comparative study. The charac- 

 teristics which place these insects in the same group should 

 be noted. Special attention should be given to the method 

 of caring for the young and the advance shown in division 

 of labor by the different families. Mud daubers, polistes, 

 hornets, honeybees, and ants should be taken up in order. 



