SOUND RECEPTION 



07 



100,000 



10.000 — 



1000 



100 



I- 



001 — 



0001 



50 100 200 400 800 1.000 2,000 4000 8,000 



Cycles per Second 



Fig. 69. Vibration thresholds in my. (ordinate) in relation to frequency 

 (abscissa) for insects representing three levels of sensitivity. (Redrawn 

 from Antrum and Schneider, 1948.) 



sensitive forms include the beetles Geotrupes and Melolontha, the 

 butterfly Pyrameis, the cockroach Periplaneta, and the cricket 

 Liogryllus (Autrum and Schneider, 1948; Schneider, 1950). In the 

 insensitive group there are responses to stimulus frequencies ranging 



