Recording stridulation sounds by male Tomicus piniperda

Tomicus piniperda females were released on a Scotch pine log. They immediately try to find places to bore in by wedging their way under bark flakes so that they can get a good grip when they bite and chew their way into the bark. After an hour an equal number of males were released and these immediately begin to stridulate and can be heard without the aid of a microphone/amplifier. I'm recording the stridulatory sounds in a "sound proof" box with controlled photoperiod. The lighting was done with a 7 W fluorescent lamp so that heating inside the closed box (after photo taken) does not vary much between light and dark conditions.

Byers, J.A. 1989b. Behavioral mechanisms involved in reducing competition in bark beetles. Holarctic Ecology 12:466-476.
Chemical Ecology