. Catalogue of the described Lepidoptera of North America. Prepared for the Smithsonian Institution. Lepidoptera -- North America. WINGS, alee. Figs. 1, 20—28. There are two pairs of wings, the fore wings, alts anteriores, fig. 20, and hind wings, alee posteriores, fig. 21, indifferently called pri- maries and secondaries, or superiors and inferiors—sometimes rudi- mentary or imperfect in the females, very seldom entirely wanting. The primaries lie with their hind edge on the fore edge of the secondaries, and cover the latter entirely in most of the nocturnal moths when in a state of repose. T
. Catalogue of the described Lepidoptera of North America. Prepared for the Smithsonian Institution. Lepidoptera -- North America. WINGS, alee. Figs. 1, 20—28. There are two pairs of wings, the fore wings, alts anteriores, fig. 20, and hind wings, alee posteriores, fig. 21, indifferently called pri- maries and secondaries, or superiors and inferiors—sometimes rudi- mentary or imperfect in the females, very seldom entirely wanting. The primaries lie with their hind edge on the fore edge of the secondaries, and cover the latter entirely in most of the nocturnal moths when in a state of repose. The secondaries are often folded together when at rest, and in that case usually have on the upper edge near the root, a strong elastic, sometimes double hair or bris- tle, which draws itself through a hook on the under side of the primaries and serves to maintain or render more easy the expansion of the secondaries. This is called the frennlum, fig. 21, fr. This instrument is wanting in nearly all butterflies, which do not fold the secondaries when at rest. The wings have three edges or margins, the anterior margin, maryo anterior, on the upper side, A, the interior margin, marao interior, opposite the anterior, B, and the posterior margin or seam, margo posterior or limb us, C, which is opposite the root of the wing, basis, and binds the two other margins. The angle made Kg. 20. Tiff. 21. al ab. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Morris, John G. (John Gottlieb), 1803-1895. Washington : Smithsonian Institution
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