The Phaneropterinae, the sickle-bearing bush crickets or leaf katydids, are a subfamily of insects within the family Tettigoniidae. They are also known as false katydids or round-headed katydids.

The name Phaneropterinae is based upon the Old World genus Phaneroptera (type species P. falcata), meaning "visible wing"; this refers to the exposed tips of the inner wings seen in many species, although some genera, notably in the tribes Barbitistini and Odonturini have become brachypterous.

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