PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM SMITHSONIAN INSTITUTION U. S. NATIONAL MUSEUM Vol. 110 Washington : 1959 No. 3419 A DESCRIPTION AND CLASSIFICATION OF THE FINAL INSTAR LARVAE OF THE ICHNEUMONIDAE (INSECTA, HYMENOPTERA) By J. R. T. Short ' Introduction In this paper are given a description and classification of the final instar larvae of the Ichneumonidae based on a study of species repre-senting 151 genera. Keys are given to the subfamilies, tribes, and genera. Characters of the subfamilies and tribes are described verbally, but the description of each genus usually takes the form of a diagram. Any special features are noted in the text, and when a species differs from that figured for a genus the difference is noted. Diagrams were selected as the most concise and accurate method for recording larval characters. Material and Acknowledgments In work of this nature great care must be taken to insure that only reliably identified material is used. Most of the material on which this study is based comes from the U.S. National Museum, Wash-ington, D.C. I wish to thank the Museum for permission to borrow material and I am most grateful to Miss Luella M. Walkley for her help and advice concerning this work. I am also grateful to Mr. G. ' Natural History Department, Marischal College, University of Aberdeen, Aberdeen, Scotland, 391
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