202 
Psyche 
[Vol. 87 
on a liquefied diet of the type described by Bhatkar and Whitcomb 
(1970), and water was available ad libitum in their foraging dishes 
by way of bottles, stoppered with cotton. 
Substrate vibrations were detected using a Bruel and Kjaer4344 
accelerometer, and amplified by a B & K 2304 impulse sound level 
meter on linear response. The vibrations were recorded on a Uher 
4000 Report IC tape recorder. Oscillograms were produced on a 
Tektronix 455 oscilloscope, and recorded with a Nihon Koden 
continuous photographic recorder. Attempts to record the airborne 
component of the stridulatory signal utilized a B & K4133, !/ 2 "(1.25 
cm) microphone in conjunction with the above mentioned sound 
level meter and tape recorder. The stridulatory apparatus was 
photographed with a Cambridge S 180 scanning electron micro¬ 
scope. 
Ants normally stridulate when they are restrained (Markl et al., 
1977) and, therefore, in our initial attempts to record the stridula¬ 
tory vibrations produced by a L. muscorum worker, we glued the 
ventral portion of its head to the base of the accelerometer with 
contact rubber cement. To test for the transmission of stridulatory 
Fig. 2. Same as figure 1: leading edge of the pars stridens, after removing the 
post-petiole, showing the interface between the fine structure of the file and the 
sculpturing of the adjoining region. 
