katydid

ヘレン・ケラーの "The Story of My Life"からです。
We read and studied out of doors, preferring the sunlit woods to the house. All my early lessons have in them the breath of the woods--the fine, resinous odour of pine needles, blended with the perfume of wild grapes. Seated in the gracious shade of a wild tulip tree, I learned to think that everything has a lesson and a suggestion. "The loveliness of things taught me all their use." Indeed, everything that could hum, or buzz, or sing, or bloom, had a part in my education--noisy- throated frogs, katydids and crickets held in my hand until, forgetting their embarrassment, they trilled their reedy note, little downy chickens and wild-flowers, the dogwood blossoms, meadow-violets and budding fruit trees.
"katydids" は昆虫か小動物の一種に違いありませんが何でしょうか？
・OneLook Quick Definition: large green long-horned grasshopper of North America; males produce shrill sounds by rubbing together special organs on the forewings
・American Heritage Dictionary of the English Language: Any of various green insects of the family Tettigoniidae related to the grasshoppers and the crickets, the male of which produces a shrill sound by rubbing together specialized organs on the forewings.
バッタの一種の様ですが、やはり写真を探した方が分かり易い。 Googleで探した写真を見ると日本のキリギリスと似ています。