154 ELEMENTARY LESSONS ON INSECTS 



In the preceding list we have disposed of considerable 

 groups of species under the following collective names: 



In Lepidoptera; cutworms, webworms, loopers, borers, 

 case-bearers and hornworms. 



In Coleoptera; leaf beetles, flea beetles, blister beetles, 

 borers, curculios and weevils. 



In Diptera; fruit flies, root maggots and gall midges. 



In Hymenoptera; ants and sawflies. 



In Orthoptera; grasshoppers. 

 A recent name list* of our economic species includes 524 

 species of insects, of which 162 are Lepidoptera, 151 are 

 Coleoptera, 110 are Hemiptera,f, 41 are Diptera, 23 are 

 Hymenoptera, 23 are Orthoptera, 9 are Thysanoptera, and 

 3 are scattering. 



The preceding list will show both prevalent types of pests, 

 and prevalent modes of treatment; but for specific instruc- 

 tions as to treatment, consult the bulletins J and other 

 literature dealing with particular species. 



In the following list of principal crops the crop-destroying 

 species (and groups of species) of the foregoing list are listed 

 again (by numbers only) under the plants and plant groups 

 that they infest. Use the two lists together. For example, 

 the number 26 after the word "Grape" in the following crop 

 list will tell you that there is a leaf-hopper affecting the 



* Official name list of the American Association of Economic Entomolo- 

 gists of 1925. 



t This includes the true (sucking) lice, Anoplura. 



% Obtainable on request from the sources mentioned on page 150. 



