 Mole crickets <unk> like other crickets by scraping the rear edge of the left <unk> , which forms a plectrum , against the lower surface of the right <unk> , which has a <unk> @-@ like series of asymmetric teeth : the more acute edges face backwards , as do those of the plectrum . The plectrum can move forwards with little resistance ; but moving it backwards makes it catch each tooth , setting up a vibration in both wings . The sound @-@ producing stroke is the raising ( <unk> ) of the wings . The resulting song resembles the result of <unk> a pure tone with a 66 <unk> wave to form regular chirps . In G. vineae , the wing <unk> muscle , which weighs 50 <unk> , can deliver 3 @.@ 5 <unk> of mechanical power ; G. gryllotalpa can deliver about 1 <unk> . G. vineae produces an exceptionally loud song from half an hour after sunset , continuing for an hour ; it can be heard up to 600 metres away . At a distance of 1 metre from the burrow , the sound has a mean power over the <unk> cycle of up to 88 decibels ; the <unk> recorded peak power was about 92 decibels ; at the mouths of the burrow , the sound reaches around 115 decibels . G. gryllotalpa can deliver a peak sound pressure of 72 decibels and a mean of about 66 decibels . The throat of the horn appears to be tuned ( offering low <unk> <unk> ) , making the burrow radiate sound efficiently ; the efficiency increases when the burrow is wet and absorbs less sound . Mole crickets are the only insects that construct a sound @-@ producing apparatus . Given the known sensitivity of a cricket 's hearing ( 60 decibels ) , a night @-@ flying G. vineae female should be able to detect the male 's song at a range of 30 metres ; this compares to about 5 metres for a typical <unk> cricket that does not construct a burrow . 
