STRAIGHT-WINGED INSECTS. 



257 



445. The Grasshoppers differ from the Crickets in 

 having the wing-covers, which in the latter lie horizon- 

 tally flat, so arranged as to make two slopes, like the 

 roof of a house. Of the many species I will notice but 

 one, the well-known Katydid of this country. It is about 

 one and a half inches long, and its expanded wings meas- 

 ure together three inches. The whole insect is green, 

 the wings being pale green, and the wing-covers a dark 

 green. The wings are gauze-like, and are exceedingly 

 delicate. The male, as seen in Fig. 204, has, at the base 



Fig. 204. Male Katydid. 



or root of each wing-cover, a stout horny ridge surround- 

 ing a stiff, thin membrane, making two drum-heads. It 

 is by the rubbing of these together that the peculiar 

 sound .of this insect is produced. The female Katydid 

 has no such apparatus, and therefore is perfectly still. 

 It has at the end of its body, as seen in Fig. 205 (p. 258), 



