Based on the popular title An Orvis Streamside Guide to Trout Stream Insects, this revised and updated text focuses on the mayfly species essential to anglers in North America. Veteran fly-fishing author Dick Pobst, who wrote Trout Stream Insects in collaboration with the late Carl Richards, gives the reader the keys to identifying numerous mayflies and determining the correct patterns for the different life stages¿nymph, emerger, and adult¿to fool trout. Published in a handy pocket-size, this book is intended for field use, with numerous color photos and insect silhouettes to help the angler determine what mayfly species are present at streamside. Color-coded hatch charts forecast the appearances of a wide variety of species so the angler can figure out when certain patterns should be in the fly box. Tuck this book in your vest and go.