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Résumé :
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Between 1913 and 1940 Karl Escherich wrote Volume 1, 2, 3, and 5 of his textbook and manual « Forest Insects of Central Europe ». Of this classical work, dealing with practical entomology, Volume 4 referring to hemimetabolic insects and the remaining type of butterflies has never been published. Over the years it has become obvious that a revised edition was necessary on this subject, so important to science and practice. But the extent of present knowledge regarding forest pests and the needs of modern forest protection required a completely different approach to the subject. The new work, therefore, is published not as a textbook but purely as a manual, and has contributions from numerous specialists from Germany and abroad. The manual will not only deal with insects but with all other animal genera which are forest pests. For the first time it refers to the whole of Europe. In taxonomical order the following volumes are published at intervals of at least one year: 1. Worms, snails, mites, millepeds, and hemimetabolic insects; 2. Beetles; 3. Butterflies; 4. Otherholo-metabolicinsects; 5. Vertebrates. The first volume deals exclusively with species of animal forest pests, which have not until now been described comprehensively: Nematoda, Gastropoda, Acarina, Myriapoda, and all of the hemi-metabolic insect species which infest forests, i. e. Isopoda, Orthoptera, Dermaptera, Thysanoptera, Heteroptera, and Homoptera. The outstanding points of the description are the great and important groups of gall-and spider mites, plant lice, and scale insects. This volume with 172 illustrations is meant not only to assist the administrators and owners of forest areas in identifying forest parasites but also as a reference work for forest-zoologists and phytopatologists for teaching and research, and as a basis for prevention and control for those engaged in forest protection.
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