66 



ECONOMIC ENTOMOLOGY 



ers is to use inexpensive appliances. The most important consideration 

 in the rearing of insects for the purpose of ascertaining their Hfe history 

 is to make conditions as nearly natural as possible. Cages of various 

 kinds covered with muslin or wire netting are in common use. Some 

 may be flower pots and lamp chimneys in which the host plants are 



Fig. 45. — Types of underground breeding cages, i, 15-inch pots with wire 

 ^^screen cover tops; 2, 15-inch pots with cyhnder-shaped tops. (After Davis.) 



growing; others, breeding cages of larger size and more elaborate 

 construction. 



In the study of underground forms such as white grubs and wire- 

 worms the cages are usually buried to the full depth in the earth, 

 Davis has found large flower pot cages, deep cylinder-shaped cages and 



