Abstract
Analyses, using 200 adults or 200 larvae of several stored-product insects, show that some produce adventitious sounds characteristic of the species. By a standardized system of analysis using a soundproof box, magnetic tape recordings, calibrated Bruel and Kjaer microphone, microphone amplifier, ⅓ octave band pass filter set, and level recorder, signature profiles in the form of charts showing decibels of sound energy produced at various frequencies may be obtained. Data showing the maximum energy in decibels and the greatest energy range of each species studied were gathered. The maximum energy was 40 decibels produced by the yellow meal worm, Tenebrio molitor L., with the greatest energy range from 100 cycle/sec to 1.5 kc/sec and 4 to 15 kc/sec. By comparing several charts, it is possible to recognize many of the species emitting this sound. Closely related species such as the species of Tribolium or Tenebrio could not be separated. This type of analysis shows no evidence of communication.
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