[3] “Über die Artrechte des _Polyommatus Amyntas_ und _Polysperchon_.” Stett. ent. Zeit. 1849. Vol. x. p. 177-182. [In Kirby’s “Synonymic Catalogue of Diurnal Lepidoptera” _Plebeius Amyntas_ is given as a synonym and _P. Polysperchon_ as a var. of _P. Argiades_ Pall. R.M.] [4] “Die Arten der Lepidopteren-Gattung _Ino_ Leach, nebst einigen Vorbemerkungen über Localvarietäten.” Stett. ent. Zeit. 1862. Vol. xxiii. p. 342. [5] [Eng. ed. W. H. Edwards has since pointed out several beautiful cases of seasonal dimorphism in America. Thus _Plebeius Pseudargiolus_ is the summer form of _P. Violacea_, and _Phyciodes Tharos_ the summer form of _P. Marcia_. See Edwards’ “Butterflies of North America,” 1868-79.] [6] [Eng. ed. I learn by a written communication from Dr. Speyer that two Geometræ, _Selenia Tetralunaria_ and _S. Illunaria_ Hüb., are seasonally dimorphic. In both species the winter form is much larger and darker.] [_Selenia Lunaria_, _S. Illustraria_, and some species of _Ephyra_ (_E. Punctaria_ and _E. Omicronaria_) are likewise seasonally dimorphic. For remarks on the case of _S. Illustraria_ see Dr. Knaggs in Ent. Mo. Mag., vol. iii. p. 238, and p. 256. Some observations on _E. Punctaria_ were communicated to the Entomological Society of London by Professor Westwood in 1877, on the authority of Mr. B. G. Cole. See Proc. Ent. Soc. 1877, pp. vi, vii. R.M.] [7] [In 1860 Andrew Murray directed attention to the disguising colours of species which, like the Alpine hare, stoat, and ptarmigan, undergo seasonal variation of colour. See a paper “On the Disguises of Nature, being an inquiry into the laws which regulate external form and colour in plants and animals.” Edinb. New Phil. Journ., Jan. 1860. In 1873 I attempted to show that these and other cases of “variable protective colouring” could be fairly attributed to natural selection. See Proc. Zoo. Soc., Feb. 4th, 1873, pp. 153-162. R.M.] [8] [A phenomenon somewhat analogous to seasonal change of protecting colour does occur in some Lepidoptera, only the change, instead of occurring in the same individual, is displayed by the successive individuals of the same brood. See Dr. Wallace on _Bombyx Cynthia_, Trans. Ent. Soc. Vol. v. p. 485. R.M.] [9] “Über den Einfluss der Isolirung auf die Artbildung.” Leipzig, 1872, pp. 55-62.