Fig. 1. (A) Drawing of the underside of the right forewing of a male Gryllus campestris. The harp, shown hatched, is a resonant plate that is set into vibration by the interaction during wing-closing between the file on the cubitus 2 (Cu2) vein and the contralateral plectrum. The position of the maximal amplitude of vibration of the harp, as reported by Nocke (1971) and from personal observation, is shown by an asterisk. The nomenclature of the veins follows Ragge (1955). Note the flexible regions that separate the plectrum from the file and cubitus 1 (Cu1) vein from the media vein. (B) Diagram of a section of both forewings of a typical gryllid showing the interaction between the file and plectrum during the sound-producing wing-closing stroke. The arrows show the directions in which the two wings move.
