^{page 213 note *} Fowler's, Coleoptera of the British Islands, vol. v, p. 420Google Scholar.

^{page 213 note †} Ibid.

^{page 215 note *} W. J. Eichhoff, Die europaischen Borkenkäfer, p. 101.

^{page 217 note *} In this description of the larva I have followed the terminology of Hopkins, “The genus Dendroctonus,” U.S. Bureau of Entomology, Bulletin No. 83, part i, p. 11, 1909.

^{page 223 note *} Von Oppen, , “Zur Lebensdauer des Hylobius abietis,” in Zeitschr. f. Forst. und Jagdwesen, vol. xv, 1883,Google Scholar and vol. xvii, 1885.

^{page 223 note *} Nusslin, “Über Generation und Fortplanzung der Pissodesarten,” in Forstlich naturwissenschaftlichen Zeitschrift, 1897.

^{page 223 note ‡} Macdougall, “Ueber Biologie und Generation von Pissodes notatus,” in Forstlich naturwissenschaftlichen Zeitschrift, part v, 1898. “The Biology of the Genus Pissodes,” in the Proceedings of the Royal Society of Edinburgh, 1900.

^{page 223 note §} Nusslin, Leitfaden der Forstinsektenkunde, 1905 and 1913.

^{page 223 note ∥} Knocke, “Beiträge zur Generationsfrage der Borkenkäfer,” Fortwiss. Centralblatt, 1900 and 1904.

^{page 223 note ¶} Fuchs, Über die Fortplanzungs verhältnisse der rindenbrutenden Borkenkäfer, 1907.

^{page 223 note **} Hagedorn, “Fam. Ipidæ,” in Genera Insectorum, 1910.

^{page 230 note *} Borodaewskij, P., in Liesnoj Journal (Forestry Review), year xlv, part 8–9, pp. 1222–1247, Petrograd, 1915Google Scholar.

^{page 231 note *} These Nitulid beetles feed on a number of bark-boring and bark-infesting species, Curculionid and Scolytid. See Macdougall, “On the Life-history and Habits of Rhizophagus depressus F.,” Notes of Royal Botanic Garden, No. iii, 1900; also the same Journal for the life-history and habits of Clerus formicarius, by Macdougall.