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Excerpt from Deutsche Entomologische Zeitschrift "Iris," Vol. 34: Herausgegeben von Entomologischen Verein Iris zu Dresden; Jahrgang 1920 Fur den, der die mit "weiß durchsetzten Formen nicht kennt, muß gesagt werden, daß dieser Begriff an Reinheit oft zu wunschen ubrig läßt, ebenso wie das "schwarze nach dem Ableben des Tieres und später mehr noch in der Sammlurig an Sattheit rasch abnimmt. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.