Papilio (New Series), an entomology journal, is a scientific journal that covers the systematics and taxonomy and biology of butterflies, mostly from Colorado. There are about 700 species of butterflies in North America and about 270 in Colorado, New discoveries are made every year on the Colorado species. Systematics is the study of the kinds of butterflies that exist on our planet, and taxonomy involves the names of butterflies, including the description and naming of species new to science. Papilio (New Series) started in 1981 to name the butterflies in single publications. This digital collection includes the single issues as they are published.