PLATE I. The cry of a Hying bat (Myotis) recorded by a Granith microphone 

 (upper trace) and the acoustic cells of the noctuid moth AK'ropcrina 

 diibitans (lower trace). Time mari<, 10 msec. Made in collaboration 

 with Dr Fred Webster. (Courtesy of Roeder and Treat.) 



PLATE II. Triply innervated chemosensory hair of Phormia (pig- 

 ment layer omitted). HY, hypodermis; DF, distal fibres 

 (dendrites); PF, proximal fibres (axons); N, neuron cell 

 bodies; TR, trichogen; TO, tormogen; d, thin-walled 

 cavity; C2, thick-walled cavity; VA, vacuole; TA, tracheole; 

 SP, sensory papilla. (From Dethier, 1955.) 



