Winglets: small, concavo-convex scales, generally fringed at tip, under the base of the elytra in Dytiscidae. [Please select]
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The triangular winglets, the sheaths of the elytra, open along their line of juncture and separate laterally; the two narrow blades, which contain the wings, rise in the centre of the interval and slightly diverge. [Please select]
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Are the wing-sheaths and the triangular winglets of the larva the moulds whose folds, wrinkles, and sinuosities form their contents in their own image, and so weave the network of the future wings and wing-covers. [Please select]
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