. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 90 bulletin: museum of comparative zoology shown in text figure 3, so we are obliged to admit that this Lower Permian genus had essentially the same genital and antennal structure as the most highly specialized of our recent Mecoptera. The variation in the venation and shape of the wing of Permo- panorpa inaequalis is interesting, also. In order to determine some- thing of the degree of variation which exists in recent Mecoptera, I examined over 3000 specimens of North American species, which were loaned to me by the
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. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 90 bulletin: museum of comparative zoology shown in text figure 3, so we are obliged to admit that this Lower Permian genus had essentially the same genital and antennal structure as the most highly specialized of our recent Mecoptera. The variation in the venation and shape of the wing of Permo- panorpa inaequalis is interesting, also. In order to determine some- thing of the degree of variation which exists in recent Mecoptera, I examined over 3000 specimens of North American species, which were loaned to me by the Museum of Comparative Zoology, the American Museum of Natural History, the National Museum, and other institu- tions.' Certain of the species show a remarkable variation in the form of the branches of Rs, a peculiarity which has also been recorded by Esben-Petersen (1921). It is this same vein, as previously men-. 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 work.. Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum