136 



ORTHOPTERA. 



same substances, and has, in many respects, the same habits 

 as the Cockroach. Its ringing " crink " proceeding from 

 the fii-eplace is considered a cheerful sound, and probably, 

 from its association with genial warmth and plenty, is 

 often enumerated among the amenities of the fireside. 



The shrill sound, above alluded to, is produced only by 

 the male rubbing its wings, which are peculiarly con- 

 structed, one against the other. 



The Grasshoppers (Gryllus campestris) make use of 

 their hind legs in producing their " crink." The thigh 

 is furnished with a number of transverse, overlaj)i3ing, 

 angular plates, and the shank carries a series of short 

 horny points upon each side. The insect when it crinks, 

 brings the shank up to the thigh, and rubs both to and 

 fro against the wing-sheaths, doing this by turns with the 

 right and left legs, which causes the regular break in the 

 sound. 



The Locusts [Gryllus locusta) belong to the 



same 



k 





Fig. 91.— locusts. 



family as the cricket and grasshoppe-, and, considered 



