[24]. Trans. Amer. Ent. Soc. xx, p. 168.
[25]. Proc. Ent. Soc. London. Feb. 19, 1896. Heymons also shows that the germs of the elytra of the larva of Tenebrio molitor in the prepupal stage are like those of other insects. (Sitzungs-Ber. Gesell. natur f. Freunde zu Berlin, 1896, pp. 142–144.)
[26]. Zur Entwickelungsgeschichte und Reproductionsfähigkeit der Orthopteren. Von Vitus Graber. Sitzungsberichte d. math.-naturw. Classe der Akad. d. Wissensch., Wien. Bd. lv, Abth. i, 1867; also Die Insekten.
[27]. On the transformations of the common house fly, by A. S. Packard, Jr. Proceedings Boston Society of Natural History, vol. xvi, 1874. See Pl. 3, Figs. 12a, 12b.
[28]. See our Guide to the Study of Insects, p. 66, Figs. 65, 66.
[29]. Our Common Insects, 1873, p. 171.
[30]. Compare the observations of Palmén, Gerstäcker, Vayssière, and others.
[31]. Beiträge zur Kenntniss der Termiten. Jenaische Zeitschrift für Naturwissenchaft, Bd. ix, Heft 2, p. 253, 1875. Compare, however, Palmén’s Zur Morphologie des Tracheensystems, Helsingfors, 1877, wherein he opposes Müller’s view and adopts Gegenbaur’s. See p. 8, footnote.
[32]. Pancritius, who also adopted Müller’s views, lays much stress on the fact that in larvæ of some orders the tracheæ do not enter the rudimentary wings until the end of larval life, and hence the wings have not originated from tracheal gills, but were originally “perhaps only protective covers for the body.”
[33]. Reproduced from the author’s remarks in Third Report U. S. Ent. Commission, pp. 268–271, 1883.