This insect's sound as he rubs his wings together is a courtship song
The courting song is used when a female cricket is near and encourages her to
... [DOC] [TLE] Songs of Insects - In Celebration of Our Singing Insects [PAR] In biology, "song" generally refers to a sound made by an animal during its ... and 
katydids produce their songs by rubbing their wings together (technically, it is ... 
courtship flights (when the snaps might be construed as a form of "song), but... [DOC] [TLE] How Insects Make Sounds - About.com [PAR] Imagine yourself walking outside on a warm August day.