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About the Cover
Cover: A male katydid, Arachnoscelis n. sp., and oscillograms of the signal with which it calls females at night. It's remarkably narrow spectrum, peaking at ∼130 kHz, is the highest fundamental frequency known for an insect. Montealegre-Z, Morris and Mason (pp. 4923
-4937) show that these extreme ultrasonic pulses are produced by one wing part slipping over another at elevated velocities. They compared low- and high-frequency species that use pure-tone calling songs and suggest that enhanced wing velocities are achieved by scraper distortion, a mechanism that stores and releases elastic energy. (Photo: Dita Klimas.)
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