. 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. 84 Joh7i Henry Cmnstock I was led to make a careful study of this part of the wing by the discovery that in Hepialis an entirely different method of uniting the two wings of each side has been developed. In this genus, and as I have since discovered in Micropteryx also, instead of the wings being joined by a frenu
. 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. 84 Joh7i Henry Cmnstock I was led to make a careful study of this part of the wing by the discovery that in Hepialis an entirely different method of uniting the two wings of each side has been developed. In this genus, and as I have since discovered in Micropteryx also, instead of the wings being joined by a frenuhim, which is a bristle or a bunch of bristles borne by the hind wing, they are joined by a membranous lobe extending back from near the base of the inner margin of the fore wing (Fig. 27, 28, j). To this lobe I have applied the name Jjigufn. When the wings olHepialis are extended, the jugum pro- jects back beneath the costal border of the hind wing, which,. in. viii viijvn, ^3 * Fig. 28.—Micropteryx. being overlapped by the more distal portion of the inner mar- gin of the fore wing, is thus held between the two, as in a vice. The discovery of the fact that there are two distinct modes of uniting the wings during flight suggests the inference that in the primitive Lepidoptera the wings were united in neither way. For it is not easy to see how one mode could have been developed from the other. It is probable that in the primitive moths the mesothorax and metathorax were much more distinct than in the recent forms ; and consequently the two pairs of wings were farther. 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 Wilder, Burt G. (Burt Green), 1841-1925. fmo; Jordan, David Starr, 1851-1931. ins; Comstock, John Henry, 1849-1931. ins; Dudley, William Russel, 1849-1911. ins; Corson, Eugene Rollin, b. 1855. in
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