104 



SYSTEMATIC ZOOLOGY 



The earwigs (Fig. 198) feed on fruit and flowers; they are 

 rare in the United States ; our common species is less than half 

 a centimeter long. They are nocturnal in habit, and the same is 



true of the cockroaches 

 (Fig. 199), which have a 

 wider distribution, and are 

 common both in and out 

 of doors. Main- are wing- 

 less, and some attain a 

 considerable size. The 

 curious walking stick 

 (Fig. 200) is a member of 

 this order, and also the 

 leaf insect (Fig. 201), 

 which so closely resembles 

 a green leaf. The crickets 

 (Fig. 202), locusts (Fig. 

 203), and katydids are 

 all jumping Orthoptera. 

 The true locusts have 

 short antennae, the true 

 grasshoppers have long 

 antennae, and in both the 

 female usually has a 

 prominent ovipositor. 

 The crickets have long 

 antenna% and a long, 

 slender ovipositor. 



Order 4. Hcmiptera 



The Hemipteral Gr. 1)1x1. 

 half, and irrepov, wing), 



sometimes call e d the 



Rhynchota (Gr. pvyx^, 



beak), constitute a large 



order of insects, presenting a great diversity oi form and habit of 



life. Many are of considerable economic importance because of 



the injury they do to vegetation. In general they have two pairs 



Fl .. 200. Diapheromera femorata, J . the common 

 walking stick of the United States; natural 

 (Drawn from specimen.) 



