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.