Note 2 — INTRODUCTION.
Reading edition
Kirby and Spence observe that some insects which are not naturally aquatic, do, nevertheless, swim very well if they fall into the water. They instance a kind of grasshopper (Acrydium), which can paddle itself across a stream with great rapidity by the powerful strokes of its hind legs.—(Introduction to Entomology, 5th edit., 1828, p. 360.) Nor should the remarkable discovery by Sir John Lubbock of a swimming insect (Polynema natans), which uses its wings exclusively as fins, be overlooked.—Linn. Trans. vol. xxiv. p. 135.