Cæcum, xiii Caterpillars, ix Classification, xvi Clavate intestine, x Coincidence of veins, xii Colon of imago, xiii " of larva, x Concurrence of veins, xii Connection of veins, xii Contrast colours, xv Costa, xi Coxa of imago, xiii " of larva, ix Crown, x Digestive system of imago, xiii " " of larva, x Divergence of character, xiv Dorsum, xi Ecdysis, x Egg, ix Eyes, compound, x " simple, x Face, x Fasciculate-ciliated, xi Femur of imago, xiii " of larva, ix Filiform, xi Frenulum, xii Geographical distribution, xix Haustellum, xi Head, x Ilium of imago, xiii " of larva, x Imago, x Inheritance, xiv Jugum, xii Labium of imago, xi " of larva, ix Labrum of imago, xi " of larva, ix Larva, ix Legs of imago, xiii " of larva, ix Lepidoptera, descent of, xvii " arrangement of, xviii Mandibles of imago, xi " of larva, ix Maxillæ of imago, xi " of larva, ix Mimicry, xv Natural selection, xiv Neuration, xii Obsolescence of veins, xii Ocelli, x Oesophagus of imago, xiii " of larva, x Ornamental colouring, xv Palpi, labial, of imago, xi " " of larva, ix " maxillary, of imago, xi " " of larva, ix Pectinated, x Præcostal spur, xii Proboscis, xi Prolegs, ix Protective resemblance, xiv Pseudoneuria, xii Pubescent, xi Pupa, x