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CHAPTER II 



OTHEE COMMON INSECTS 



In the preceding chapter we studied the grasshopper, a 

 typical member of the Orthoptera. We shall now take up 

 several other orders of insects, with most of which we are 

 already familiar. 



15. Hemiptera. — Another common order of insects is 

 the Hemiptera (he-mip'ter-a: Greek, hemi, half; pteron, 



Figure 17. — Scale Insects on Fern. 



wing). To this order belong such common insects as 

 the cicadas, plant lice, the woolly aphis, and the bane of 

 the orchard, the San Jose (san ho-sa') scale. Some of 

 these are very harmful. When the San Jose scale is 

 allowed to feed freely, whole orchards may be destroyed. 

 Plant lice injure apple, cherry, and peach trees, and the 



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