CHAPTER XXII 



INSECTS ON THE FARM 



225. There are a great many kinds of insects found 

 on the farm, many of them useful, while other kinds are 

 injurious because they feed on plants, stored products, 

 and domestic animals, according to the habits of the 

 pest in each case, and even our own comfort and health 

 are affected by various forms of these creatures. Not all 

 the small animals are properly called insects. Insects have 

 just six legs, and their bodies are made up of three parts 

 that may be easily distinguished: First, the head; second, 

 the thorax, or middle part; and third, the abdomen. The 

 spiders, ticks, mites and scorpions have eight legs and 

 never have wings. 



The common sow- 

 bug has fourteen 

 legs and is classed 

 with the crabs and 

 craw-fish rather 

 than true insects. 



226. Changes of 

 Form in the Growth 

 of Insects. Nearly 

 all species of in- 

 sects have four 

 forms in passing 

 from the egg to the 



mature insect. It Fig 94< Stages in the life histor y of the June - 



bug. After Howard Division of Entomology, 

 IS like the Story Of United States Department of Agriculture. 



(155) 



