. Animal biology. Zoology; Biology. 278 METAZOAN PHYLA the result of rubbing rough surfaces together. The locust rubs the femora of the hind legs against the outer surfaces of the tegmina or produces the crackling sound heard in flight by rubbing the front edges of the hind wings against the tegmina. The shrilling of a cicada is due to the vibration of a stiff chitinous membrane drawn across a sound chamber; this vibration is controlled by muscles. The buzzing of many insects is due to rapid vibration of the wings. The auditory organ of a locust is a pit, or tympanum, on the first abdominal me
. Animal biology. Zoology; Biology. 278 METAZOAN PHYLA the result of rubbing rough surfaces together. The locust rubs the femora of the hind legs against the outer surfaces of the tegmina or produces the crackling sound heard in flight by rubbing the front edges of the hind wings against the tegmina. The shrilling of a cicada is due to the vibration of a stiff chitinous membrane drawn across a sound chamber; this vibration is controlled by muscles. The buzzing of many insects is due to rapid vibration of the wings. The auditory organ of a locust is a pit, or tympanum, on the first abdominal metamere, closed by a thin kidney-shaped tympanic membrane (Fig. 170). Organs believed to be auditory also exist on the antennae of many insects and on. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wolcott, Robert Henry, 1868-1934. New York ; London : McGraw-Hill Book Company, Inc.
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