Does the lover make use of his faculty as a means of seduction and appeal?
Does the female answer the chirp of her _innamorata_ by a similar chirp?
That this may be so under normal conditions, amidst the foliage of the pines, is extremely probable; but I can make no assertion, as I have never heard anything of the kind either among the pines or in my laboratory.
The sound is produced by the extremity of the abdomen, which gently rises and falls, rubbing, as it does so, with its last few segments, the hinder edge of the wing-covers, which are held firm and motionless.
There is no special equipment on the rubbing surface nor on the surface rubbed.

The magnifying-glass looks in vain for the fine striations usually found in the musical instruments of the insect world.

All is smooth on either hand.

How then is the sound engendered?
Rub the end of the moistened finger on a strip of glass, or a window-pane, and you will obtain a very audible sound, somewhat analogous to that emitted by the chafer.

Better still, use a scrap of indiarubber to rub the glass with, and you will reproduce with some fidelity the sound in question.