Katydid n. (Zool.) A large, green, arboreal, orthopterous insect (Cyrtophyllus concavus) of the family Locustidae, common in the United States. The males have stridulating organs at the bases of the front wings. During the summer and autumn, in the evening, the males make a peculiar, loud, shrill sound, resembling the combination Katy-did, whence the name.
... a show in the town hall tonight. it was a singing show called the haymakers. it was splendid. Mr. Gale got it up. they have been practising all winter. Alice Gewell was a dary maid and Charlie Lane was a katydid, and lots of others ... — The Real Diary of a Real Boy • Henry A. Shute
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