The first photographic field guide to present the moths of western North America as they are found in nature, making it easy to use for novices and experts alike Western North America is home to a surprising array of moth species that come in a variety of colors and sizes. This richly illustrated field guide covers 1,900 of the most commonly occurring species in the region, from the United States-Mexico border north to Edmonton, Alberta, and central British Columbia. Images on the full-color plates are marked with arrows to help users quickly know the most important features to look for, while facing-page species accounts highlight these features and, when applicable, how they differ from those of similar species. Whether you are a beginning moth enthusiast or a seasoned observer in the field, Moths of Western North America is the ultimate photographic guide to these marvelous insects. Covers 1,900 of the most common species in western North America Features more than 2,000 spectacular color photos of live specimens, at rest, including examples of variations and sexual dimorphism where present Species accounts describe key identification features and include information on caterpillar host plants, the time of year in which adults may be found, and the probability of encountering each species Includes a range map for each species Provides invaluable tips for newcomers on how to get started observing moths.