Dicke, Robert J. (ed.) / Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume XLIV (1955)
Smith, Lois K.; Shenefelt, Roy D.
A guide to the subfamilies and tribes of the family Ichneumonidae (Hymenoptera) known to occur in Wisconsin, pp. 165-219 ff. PDF (15.0 MB)
A GUIDE TO THE SUBFAMILIES AND TRIBES OF THE FAMILY ICHNEUMONIDAE (HYMENOPTERA) KNOWN TO OCCUR IN WISCONSIN' Lois K. SMITH and Ro~ D. SHENEFELT2 INTRODUCTION The study of ichneumonids in Wisconsin was undertaken to obtain information necessary to make better use of them in combatting our insect foes. Ichneumonid larvae all parasitize insects or arachnids, either internally or externally. Because of the large number of economically important pests among their hosts, and the role which ichneumonids occupy in reducing their numbers, the family is of great benefit to man. Before methods can be developed to favor these insects by creating more desirable habitats, a knowledge of what is present and the ecology and habits of the various species is necessary. Acquiring a knowledge of what inhabits an area is thus the first step in a series designed to take greater advantage of parasitic insects. Adults of the family may easily be distinguished from other Hymenoptera by the following characters. The flagellum has at least fifteen segments. The sides of the pronotum reach or cover the first pair of thoracic spiracles, and in winged forms extend to the tegulae. The first morphological segment of the abdomen is fused solidly to the third thoracic segment, forming the propodeum (which always bears a pair of spiracles). The trochanters of at least the hind pair of legs are apparently double. The forewing has a distinct stigma, the first cubital and first discoidal cells confluent (forming the discocubital cell). and, except in Ophionellus, two recurrent veins. The venter of the abdomen is never heavily sclerotized. In this paper keys and other materials are presented to assist in placing the adult members of the family in their respective subfamilies and tribes. The taxonomic arrangement and nomenclature follow that given by Townes in the Catalogue of Hymenoptera of America North of Mexico by Muesebeck and others, 1 This work was supported in part by the Research Committee of the Graduate School of the University of Wisconsin from funds supplied by the Wisconsin Alumni Research Foundation. Published with the approval of the Director of the Wisconsin Agricultural Experiment Station. 2 Research Assistant and Associate Professor, respectively, Department of Entoinology, College of Agriculture, University of Wisconsin. 165
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