ORTHOPTERA. 



183 



which are familiar from the persistence with which they 

 haunt our dwellings, etc., after they have once been intro- 

 duced. Our familiar " Croton bug" is an immigrant from 

 Europe, but we have also our native species. Insect- 

 powder and eternal vigilance are 

 the only means known to rid a \. 

 building of these pests. \ 



Strangest of our Orthoptera are 

 the " walking-sticks"; long, wing- 

 less animals which feed upon the 

 oak and which, as they stand mo- 

 tionless upon a twig, can scarcely 

 be distinguished from the twigs 

 themselves. The species figured is 

 foreign. 



Grasshoppers and locusts are 

 much alike, and are usually con- 

 fused by most people. Both are 

 leaping forms, but the locusts have 

 short antennae and short oviposi- 

 tors, while the grasshoppers have 

 these parts long. The katydid is 

 a grasshopper, while the "grass- 

 hopper" which in 1873-76 did 

 such damage in our Western States 

 is a locust. Closely allied are the 

 crickets, whose ceaseless chirp is so Fl 

 monotonous upon summer nights. 

 These make their song by rubbing their wing-covers 

 together, and it is interesting that only the male can make 

 the noise. The "ear" of the cricket is not upon the 

 abdomen, but upon the fore legs. It is not certain that 

 any of these structures are really for hearing. 



79. Walking - stick 

 (Acanihoderus). From Hert- 



