STRAIGHT-WINGED INSECTS. 257 
A145. 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 
—_ 
Np 
p} 
LEA 
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), 
