=Holmgren, Emil.= Studier öfner hudens och de körtelartade hudorganens morfologi hos Skandinaviska macrolepidopterlarver. (K. Svenska Vetenskaps-Akad. Handl., xxvii, pp. 1–83, Stockholm, 1895, 9 Pls.) Also the writings of Leydig, Keller, Bach, Karsten, Scribner, Riley, etc. (See also Literature of repugnatorial glands.) _c._ Androconia =Deschamps, Bernard.= Récherches microscopiques sur l’organisation des ailes der Lépidoptères. (Ann. des Sc. nat. [?], iii, pp. 111–157, 1835.) =Waufor, T. W.= On certain butterfly scales characteristic of sex. (London, 1867–68.) =McIntire, S. J.= Notes on the minute structure of the scales of certain insects. (London, 1871.) =Anthony, J.= The markings on the battledore scales of some of the Lepidoptera. (London, 1872.) =Scudder, S. H.= Antigeny or sexual dimorphism in butterflies. (Proc. Amer. Acad. Arts and Sc., xii, 1877, pp. 150–158.) Also Butterflies, etc. (New York, 1881, pp. 192–206, figs.) =Müller, Fritz.= A prega costal das Hesperideas. (Archivas do Museo nac. do Rio de Janeiro, iii, pp. 41–50, 2 Pls., 1878.) =Thomas, M. B.= The androconia of Lepidoptera. (Amer. Nat., xxvii, pp. 1018–1021, 2 Pls., 1893.) _d._ Scales =Leydig, Franz.= Zum feineren Bau der Arthropoden. (Archiv f. Anat. und Phys., 1855, pp. 376–480, 1 Taf.) =Semper, Carl.= Beobachtungen über die Bildung der Flügel, Schuppen, und Haare bei den Lepidopteren. (Zeitschrift f. wissensch. Zoologie, 1857, pp. 326–339, 1 Taf.) =Mayer, F. T. Karl.= Ueber den Staub der Schmetterlingsflügel. (Allgem. mediz. Centralzeitung, 1860, pp. 772–774.) =Landois, H.= Beiträge zur Entwicklungsgeschichte der Schmetterlingsflügel in der Raupe und Puppe. (Zeitschr. f. wissensch. Zoologie, xxi, 1871, pp. 305–316, 1 Taf.) =Weismann, August.= Ueber Duftschuppen. (Zool. Anzeiger, i, 1878, pp. 98–99.) =Dimmock, George.= Scales of Coleoptera. (Psyche, iv, pp. 1–11, 23–27, 43–47, 63–71, 1883.) =Schaeffer, Cäsar.= Beiträge zur Histologie der Insekten. (Zool. Jahrbücher, Abth. f. Anat. u. Ontog., iii, pp. 611–652, 2 Pls., 1889.) =Kellogg, Vernon L.= The taxonomic value of the scales of the Lepidoptera. (Kansas Univ. Quart., iii, pp. 45–89, figs. 1–17, 9 Taf., 1894.) =Mayer, Alfred G.= The development of the wing-scales and their pigment in butterflies and moths. (Bull. Mus. Comp. Zool., xxix., 1896, pp. 209–236, 7 Pls.) =Spuler, Arnold.= Beiträge zur Kenntniss des feineren Baues und der Phylogenie der Flügeltedeckung der Schmetterlings. (Zool. Jahrb. Abth. f. Anat. u. Ontog., viii, pp. 520–543, 1 Taf., 1895.) —— Ueber das Vorhandensein von Schuppenbalg bei den Schmetterlingen. (Biol. Centralblatt, xvi, Sept. 15, 1896, pp. 677–679, 3 figs.) THE COLORS OF INSECTS