Fauna of British India, Moths, i. 1892, p. 6.
It is impossible for us to treat of the difficulties that exist on this point, and we must refer the student to the pamphlet, "The Venation of the Wings of Insects," by Prof. Comstock, Ithaca, 1895, being a reprint, with an important prefatory note, from the Elements of Insect Anatomy, by J. H. Comstock and V. L. Kellogg, also to Packard's discussion of the subject in Mem. Ac. Sci. Washington, vii. 1895, pp. 84-86. The method of Spuler, alluded to in these two memoirs, is based on development, and, when extended, will doubtless have very valuable results. See Spuler, Zeitschr. wiss. Zool. liii. 1892, p. 597.
The structure and development of scales and nervures is dealt with as part of the brief study of the development of the wing, on p. 329, etc.
The internal anatomy of Lepidoptera has not been extensively studied. For information refer to Dufour, C.R. Ac. Paris, xxxiv. 1852, p. 748; Scudder, Butt. New England, i. 1889, p. 47; Minot and Burgess, Fourth Rep. U. S. Entom. Comm. 1885, p. 53.
Tr. Linn. Soc. London (2), v. 1890, p. 143.