Chap. x. 
ORTHOPTERA. 
357 
Fig. 13. 
Hind-leg of Stenobothrus pratorura 
r, the Btridulattng ridge ; lower figure, the 
teeth, forming the ridge, much magnified 
(from Ijandois). 
across the sharp, projecting nervures on the wing-covers, 
' v hich are thus made to vibrate and resound. Harris 3 
Says that when one of 
the males begins to play, 
he first “ bends the shank 
‘‘of the hind-leg beneath 
“the thigh, where it is 
“lodged in a furrow de- 
signed to receive it, 
“ and then draws the leg 
“briskly up and down. 
“He does not play both 
“ Addles together, but al- 
“ ternately first upon one 
“ and then on the other.” 
la many species, the base 
°f the abdomen is hollowed out into a great cavity 
"'hich is believed to act as a resounding board. In 
hneumora (fig. 14), a S. African genus belonging to 
mis same family, we meet with a new and remarkable 
Modification : in the males a small notched ridge pro- 
jects obliquely from each side of the abdomen, against 
"hich the hind femora are rubbed. 39 As the male is 
burnished with wings, the female being wingless, it is 
Mruarkable that the thighs are not rubbed in the usual 
Manner against the wing-covers ; but this may perhaps 
accounted for by the unusually small size of the hind- 
W- I have not been able to examine the inner 
8 Mface of the thighs, which, judging from analogy, 
"‘ould be finely serrated. The species of Pneumora 
We been more profoundly modified lor the sake of 
'Hidulatiou than any other orthopterous insect ; for 
33 1 Insects of New England,’ 1812, p. 133. 
39 Westwood, ‘Modern Classification,’ vol. i. p. 462. 
