HEMIPTERS: TREE-HOPPERS. 169 



called the Seventeen-year Locust, but it is in no sense 

 a Locust, and should not be called by this name. The 

 name " Seventeen-year " is given to it from the belief 

 that it appears in the same place only once in seven- 

 teen years. 



The Dog-day Harvest Fly is over an inch long, the 

 body black above, marked with green, and the under 

 side covered with a white substance resembling flour. 

 It appears at the beginning of dog-days, and its sing- 

 ing may be heard among the trees through the middle 

 of the day. The pupa3 of this species and of the Sev- 

 enteen-year Cicada, as they come out of the ground 

 and crawl up the trees, look like beetles. Soon the 

 pupa-skin splits on the top of the back, and from the 

 opening thus made the perfect Cicada comes forth, 

 leaving the brown pupa-skin attached firmly to the 

 tree, and at a little distance looking as when alive. 



TREE-HOPPERS. 



These insects are remarkable for their curious and 



Fig. 318. Tree-Hopper. Fig. 319. Same enlarged. 



often grotesque shapes. They live on the sap of trees 

 and herbs, and imbibe it in such quantities that it 

 oozes out of the body, often concealing the insect in a 

 mass of frothy matter or foam. Figure 318 shows one 

 of the common kinds, as seen when looking upon its 

 back, and Figure 319 is the same in profile, and con- 

 siderably enlarged. 



