Bugs of the Month: Manduca rustica Learn about the large and beautiful Manduca rustica, or the Rustic sphinx moth, from larva to pupa and adult. Manduca rustica is often referred to as a hawk or sphinx moth. The Manduca rustica has very large larva (caterpillars) and adults, and are important desert pollinators. Look out for them on your Desert Willow after the monsoon season!