Studies on the time domain characters of songs and the stridulatory organs of Locusta migratoria migratoria
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Key Words：Locusta migratoria migratoria， stridulatory organs， song， time domain
Abstract： The morphology of the stridulatory organs of Locusta migratoria migratoria (L.) was examined with a scanning electron microscope and the time domain characters of its songs analyzed. Stridulation in Locusta migratoria migratoria involves the forewing acting in combination with the rear femur. Rubbing stridulatory teeth on the middle intercalary vein of the forewing with on the rear femur produces sound. Stridulatory teeth with a circular granular swell are distributed regularly on the middle intercalary vein of the forewing in a single line. No significant differences in the shape and arrangement of stridulatory teeth were found between individuals of Locusta migratoria migratoria. However, the number and distribution of stridulatory teeth on the middle intercalary vein differed between male and female adults. Stridulatory organs of male adults were fully developed but those of female adults were only partially developed. We infer that this is the reason why the chirp of male adults is crisp and that of female adults is hoarse. Song analysis showed that the chirp rhythm of Locusta migratoria migratoria was highly regular with an obvious double pulse. Individual chirps lasted about 0.042 s and the interchirp interval was about 0.073 s. The A and B pulse of the chirps continued for about 0.015 s and 0.017 s respectively with a pulse interval of about 0.0075 s.