INSECTS OF THE FIELD. 87 



the ground, to adopt a good system of rotation of crops, and 

 to keep the seed grain clean. 



10. Insects are arranged according to their wings. The 

 following are some of the orders : 



1. Nerve-winged or neuroptera dragon flies and may-flies. 



2. Straight- winged or orthoptera grasshoppers and crickets. 



3. Half- winged or hemiptera bugs and plant-lice. 



4. Sheath- winged or coleoptera beetles. 



5. Scaly-winged or lepidoptera butterflies and moths. 



6. Two-winged or Diptera house-flies and mosquitoes. 



7. Transparent- winged or hymenoptera . . .bees, wasps, sawflies and ants. 



NOTE. The scientific names for the above orders of insects are accented 

 on the second syllable before the last, thus : neu-rop-tera, or-thop tera, etc. 

 These words are derived from the Greek word//m?, which means a wing. 



