Science Past  from the issue of July 30, 1960

LIP-SMACKING GRASSHOPPER — A grasshopper with a talent for lip-smacking has turned out to be quite an unusual insect. Paratylotropidia brunneri Scudder is the first insect known to communicate over fairly long distances by producing an audible sound from the mouth — literally smacking its lips…. Produced at the rate of six or seven per second, usually in groups of four, the grasshopper ticks resemble a shorter, softer version of the ticking song of a katydid.