98 



AN ECONOMIC EXTOMOLOGY. 



striduhiting- urgan. Here the sound is produced l)y the ridged 

 edge of one wing-cover scraping over the ridged veins of the 

 other, setting into vibration the membraneous spaces in both 

 wings. The ear is situated on the fore-tibia, as in the Locustidce. 



Fig. 69. 



A sand-cricket, Stenofiahnatus species. 



The mole-crickets are curious, subterranean creatures, with 

 small heads and powerful forelegs, developed somewhat like the 

 corresponding organs in the mole. The larger, more common 

 species belong to the genus Gryllotaipa, and are more frequent 



Mole-crickets, Gryllotaipa species. 



in the South and Southwest, where they occasionally injure field 

 crops. They are strictly nocturnal in habit, and remain during 

 the day in their burrows, in which a chamber is excavated to 

 contain the eggs. 



