Rocky Mountain Parnassian (Parnassius smintheus sayii) caterpillars feed on Sedum lanceolata (stonecrop). You can rear these caterpillars using closed containers or 16 ounce squat tubs by providing facial tissue shavings for the larva to form a loose coccoon when it is finished feeding. Replace all contents daily; including frass, host, and facial tissue shavings.