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Why are the upper wings of insects called elytra or wing- cases?

April 26, 2017called cases insects Upper wings

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Why are the upper wings of insects called elytra or wing- cases?

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Because they serve as a covering to the inferior ones. Strictly speaking, these elytra are not wings, since they perform no other motion than elevation and depression, and serve merely to protect the wings when at rest, not to assist them when flying.