Studies in the Theory of Descent: Volume I, Том 1

able according acquired action adaptation adult already appear become border brood brown butterflies caterpillars causes certainly Chærocampa characters climatic cold colour completely conclusion considerably considered course dark Deilephila depend direction distinct eggs emerged entirely existence experiments explained extent external eye-spots fact female figured former fourth further genus gradually green hibernate horn importance individuals influence insect instance known larva larvæ latter leaves less Levana light living male manner Marcellus markings means natural natural selection oblique stripes observations occur ontogeny origin period phyletic possess possible present produced Prorsa protective pupa pupæ question remaining resemblance ring-spots seasonal dimorphism segments sexual shown side similar single species specimens spots stage subdorsal line summer summer form takes Telamonides temperature third trace transformation variation varieties whilst whole wings winter form yellow young