[67] [Eng. ed. Since the appearance of the German edition of this work, numerous descriptions of the young stages of caterpillars have been given, but in all cases without representing the relationship of the forms.] [In the excellent figures of larvæ at various stages of growth, given in some of the more recent works on Lepidoptera, there will be found much material which may be regarded as a contribution to the field of research entered on by the author in the present essay, _i.e._ the ontogeny and comparative morphology of larval markings, although it is much to be regretted that the figures and descriptions have not been given from this point of view. In his “Butterflies of North America,” for example, W. H. Edwards figures the young as well as the adult larvæ of species of _Apatura_, _Argynnis_, _Libythea_, _Phyciodes_, _Limenitis_, _Colias_, _Papilio_, &c. Burmeister, in his recently published “Lépidoptères de la République Argentine,” figures the young stages of species of _Caligo_, _Opsiphanes_, _Callidryas_, _Philampelus_, &c. Messrs. Hellins and Buckler have figured and described the early stages of large numbers of the caterpillars of British Lepidoptera, but their figures remain unpublished. The larvæ of many of our native species belonging to the genera _Liparis_, _Tæniocampa_, _Epunda_, _Cymatophora_, _Calocampa_, &c., are dull when young, but become brightly coloured at the last moult. Such changes of colour are probably associated with some change, either in the habits or in the environment; and a careful study of the ontogenetic development of such species in connection with their life-history would furnish results of great value to the present inquiry. The same remarks apply to those _Noctuæ_ larvæ which are brightly coloured in their young stages, and become dull when adult.