Definition of "katydid"

I have noticed all these, and some at a much earlier date than the first faint lisping of a timid katydid; and all such sights and sounds are similarly suggestive—the summer is drawing to its close.

1889, Charles Conrad Abbott, Days Out of Doors, New York: D. Appleton and Company, page 194

In the night the katydids and crickets screeched in waves, soft then loud, back and forth.

2019, Colson Whitehead, The Nickel Boys, Fleet, page 52