If you look carefully, so can see the wings moving up against the hole in the leaf as the male sings.  This species commonly makes a hole the same size and shape of his opened wings -- so that when he sings, the wings are flush with the leaf.  This amplifies the volume of his singing -- a self-made baffle.

Male Neoxabea bipunctata.

Female Neoxabea bipunctata.  The 'knob' is visible on the pedicel of the right-sided antenna.

This is the male Two-spotted tree cricket who sent me on my journey in 2006 to find out more about the little bug that was making so much noise on my patio.  He chewed the hole in this sunflower leaf - an exact size and shape of his opened wings - to act as a baffle or amplifier for his song.

Nice view of the metanotal gland as the male raises his wings to sing.

Video of a Two-spotted male tree cricket taking flight - quite possibly the first time this has been caught on video for this species.

Description by Charles DeGeer.