. The Wilder quarter-century book: a collection of original papers dedicated to Professor Burt Green Wilder at the close of his 25th year of service in Cornell University (1868-1893). Wilder, Burt G. (Burt Green), 1841-1925; Zoology; Anatomy; Physiology; Evolution; African Americans. 78 John Henry Comstock Vlh backwards and become consolidated with the subcosta. A good illustration of this is presented by the European genus ZygcBna (Fig. 19). Here the costa and subcosta are distinct for a considerable distance, but become united into a single vein. It will be observed that the basal portion of
. The Wilder quarter-century book: a collection of original papers dedicated to Professor Burt Green Wilder at the close of his 25th year of service in Cornell University (1868-1893). Wilder, Burt G. (Burt Green), 1841-1925; Zoology; Anatomy; Physiology; Evolution; African Americans. 78 John Henry Comstock Vlh backwards and become consolidated with the subcosta. A good illustration of this is presented by the European genus ZygcBna (Fig. 19). Here the costa and subcosta are distinct for a considerable distance, but become united into a single vein. It will be observed that the basal portion of costa extends like a cross vein and forms a strong support for the frenulum. This part of costa is sometimes preserved when the remaining part is wanting. See figure of Castnia (Fig. 15J. In most genera of the Geo- raetridse there is a faint indica- tion of a remnant of costa ex- tending from the humeral angle, at the base of the frenulum, to the subcosta, which is strongl}' angulated. The same thing is shown in Euphanessa, (Figs. 20, 21), which is probably a Geometrid genus. In many of the Psychidae a remnant of costa is preserved (Figs. 22, 23}. Here subcosta and radius are united for a considerable distance ; then they separate and subcosta soon becomes joined to costa for a short distance. In Figure 23 I have represented what I believe to be the course of these three veins, slightly separating them where they are coalesced. That part of subcosta that lies between its separation from radius and its union with costa appears like an oblique cross vein ; and had the short spur that represents the termi- nal part of costa been lacking, its true nature would not have been suspected. Does not this arrangement of the veins in the Psychidfe afford an explanation of the origin of the so- called intercostal vein which is characteristic of the Sphingidse ? See Figure 24. In many butterflies the base. Fig. 'vn, -Euphanessa. Fig. 21. — Hu- meral angle of hind wing of Eiiphcnessa.
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