From the damselfly to the whirligig beetle, America's streams are teeming with critters. This convenient, inexpensive guide allows you to identify any that you find – whether you're working on your fly tying, researching the local insect life, or just mucking around in the river. Also includes information on the river conservation and management work performed by the Izaak Walton League, making this an especially valuable resource for stream monitors, biologists, and other specialists.
This is a revised and updated edition of the book Monitor's Guide to Aquatic Macroinvertebrates, originally published in 1992 by the Izaak Walton League of America.