Contains detailed information on more than 2800 species of butterflies and moths. Data include:

• Dynamic distribution maps showing verified species occurrences
• Photographs of the adult and caterpillar (when available)
• Species accounts containing information on size, identifying characteristics, life history, flight, caterpillar hosts, adult food, habitat, species range, conservation status, and management needs
• Species checklists for each county in the U. S. and state in northern Mexico