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This classic reference explains the aquatic insects that are most important to fly anglers and shows how understanding their life cycles can improve success on the water. Harris combines scientific accuracy with practical fishing knowledge, covering mayflies, caddisflies, stoneflies, midges and other insects, along with their nymph, emerger, dun and spinner stages. The book also explains how fish respond to different insects and how anglers can match natural hatches with artificial flies. It is an excellent resource for fly fishers who want to deepen their understanding of entomology as well as naturalists interested in fresh water insects. First published in 1952 as volume 23 of the New Naturalist series, it remains one of the most respected works on the subject. B&w photographs throughout. Good condition. Hardcover, 23cm x 15.5cm, 268 pages.