Excerpt from The Grass and Grain Joint-Worm Flies and Their Allies: A Consideration of Some North American Phytophagic Eurytomin� Ten years ago, when Prof. F. M. Webster, then a field agent of this division, was engaged in studying certain grain-stalk and grass-stalk insects in Indiana and Ohio, and at about the time when he succeeded in securing the material upon which Dr. Riley established, with his assistance, the fact of dimorphism and alternation of generations of Isosoma tritici and I. Grande, he collected and ...
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Excerpt from The Grass and Grain Joint-Worm Flies and Their Allies: A Consideration of Some North American Phytophagic Eurytomin� Ten years ago, when Prof. F. M. Webster, then a field agent of this division, was engaged in studying certain grain-stalk and grass-stalk insects in Indiana and Ohio, and at about the time when he succeeded in securing the material upon which Dr. Riley established, with his assistance, the fact of dimorphism and alternation of generations of Isosoma tritici and I. Grande, he collected and reared several other species of Isosoma, and a little later Mr. Koebele, in California, also an agent of the division, reared several additional Species. At that time the writer drew up a rather careful paper on the genus as it was then understood, characterizing all the new forms, and had competent figures of the most important species prepared. The manuscript was then laid aside in the hope that further facts would be ascertained concerning the life history of some of the Species which would render the account more complete. Other matters have interfered, however, with the proposed studies, and as the importance of placing the facts already collected upon record and of describing and naming the new forms seems great, the whole subject has been carefully gone over again in the light of recent papers which have been published (espe cially by Mr. Ashmead), and which involve certain generic changes in the subfamily Eurytominae, and the results are presented herewith. The writer has included in his account only the species which have been reared or of which we know the habits with some certainty. There are several additional species in Mr. Ashmead's collection and in the collection of the National Museum, but we do not know their specific habits, and they are omitted from present consideration on that account. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at ... 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.
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