RECORDINGS OF HIGH WING-STROKE AND THORACIC VIBRATION FREQUENCY IN SOME MIDGES

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Abstract
1. Experiments on recording flight-tones and thoracic vibrations in intact and wing-mutilated midges (Chironomus, Forcipomyia), using double-beam cathoderay oscillograph and film and acoustic method, are reported. 2. In Forcipomyia, a wing-stroke frequency of 2218/sec. was the maximum value recorded, produced in a specimen with wings cut and exposed to high temperature. 3. Some aspects of the occurrence of such high frequencies in insects, correlated to the muscle contraction frequency in general, and of the energy consumption in small insects are discussed.